(One Summer day at Gravity Falls Pool Stan try to get Gideon to out of his lawn chair, Dipper become the assistant lifeguard with Wendy, and Mabel befriends a cute merman named Mermando after Mabel and Mermando play the game of Marco-Polo. Mabel see a high diving board.)
Mabel: Wow I didn't know the diving board is that high.
Mermando: Well long time ago a man try to jump on the high diving board, he was nervous to jump the high board but he slip and fall in the water and he drowned, the lifeguard about to save him but it was too late. So no one never jump in the high diving board ever since.
Mabel: Maybe I could jump the high diving board.
Mermando: Are you sure I never see you jump on the diving board before.
Mabel: Well me and Dipper jump on the low diving board Dipper always lose his swim trunk how embarrassing ha ha.
Mermando: But it the high diving board I don't know your gonna making.
Mabel: Mermando trust me I will jump to the high diving board I will survive in Gravity Falls. (Mabel got out of the pool to go on the high diving board. Mabel see the diving board that was very high. Mabel gulps she forgot she was afraid of heights after she help Grunkle Stan overcome his fear of heights. Than Pacifica and her friends walk to Mabel.)
Pacifica: Oh look have we here look like Mabel about to go on the high dive.
Mabel: Pacifica!
Pacifica: What the matter Mabel afraid to go on the high diving board.
Mabel: No I'm not afraid to go on the high board I just want to take a look that all.
Pacifica: Oh how about you climb up and jump on the diving board to prove it. (Mabel feel sweaty and walk back to Mermando in the pool.) What wrong Mabel are you chicken (Mabel turn around at Pacifica.)
Mabel: What did you call me Pacifica?
Pacifica: You hear me Mabel a silly scary, chicken (Pacifica and her friends made chicken sound.)
Mabel: Nobody call me a chicken.
Pacifica: So are you going to jump to prove you're not a chicken. (Mabel look at Mermando.)
Mabel: You're on let see who a Chicken or not for Mermando (Mabel climbing the ladder and starting to notice she's getting rather high up Mabel makes it to the high diving board.)
Mabel: You see this isn't so. (Mabel gasps and screams in fright as soon as she looks down and freezes up. Everyone turns their attention to Mabel, Dipper and Wendy walk to Soos.)
Dipper: Soos what going on?
Soos: Mabel is about to jump on the high diving board.
Dipper: What?
Wendy: Cool! (Dipper look up at his sister holding on the diving board and scare.)
Mabel: Help!
Stan: Bet you give me back my lawn chair, if Mabel going to jump.
Gideon: You're on Stanford.
Dipper: I gonna get up there and help her. (Dipper take off his white t shirt his whistle, his shoes and his pine tree hat and give it to Wendy he climb up on the ladder Mabel still hold the diving board she don't want to look down than she see Dipper makes it to the high diving board.) Mabel!
Mabel: Dipper!
Dipper: What are you doing up in the high diving board.
Mabel: I trying to jump on the high dive to prove Pacifica I'm not a chicken
Dipper: What Mabel don't listen to her you're not a chicken.
Mabel: Yes I'm Ever since I help Grunkle Stan overcome his fear of heights now I'm the one who afraid of heights.
Dipper: Well maybe I help you overcome your fear of heights.
Mabel: I can Dipper what if I fall and I really drowned.
Dipper: Don't worry Mabel I'm assistant lifeguard, I will save you if you drowning. (Dipper and Mabel almost about to fall.)
Wendy: Jump, Jump, Jump...
Crowd [chanting]: Jump, Jump, Jump...
Jump, Jump, Jump, Jump, Jump, Jump, Jump...
Dipper: What did you say Mabel.
Mabel: I'm sorry Dipper I can't do it (Dipper and Mabel about to climb back down to Gravity Falls pool.)
Pacifica: I know it she was chicken out. (Then Dipper and Mabel hold their hand and run and jumps off the high diving board screaming, together.
Soos and Wendy: Wow!
Mabel: Cannonball (Mabel do a Cannonball and Dipper diving with his hand straight down than they made to the pool and they made a big splash Pacifica and her friends got wet by a big splash. Dipper bursts out of the water first and than Mabel pops out of the water than she made it.
Mabel: I made it I'm alive
Dipper: Mabel you did it you overcome your fear of height.
Mabel: I did yes in your face Pacifica.
Pacifica: Whatever I need to dry out my hair (Pacifica and her friends leave to dry out their hair Dipper and Mabel high five.)
Wendy: Guys this is incredible you make this jump. And Dipper I can believe you help Mabel jump off the high board I impress your diving skill.
Dipper: Really
Wendy: Of course you did you help your sister overcome her fear of heights you really a good help for Mabel.
Dipper: Thanks.
Stan: Ha I know it she made it now give me back my lawn chair.
Gideon: Okay Stanford a bet is a bet you win.
Stan: Yes!
Gideon: Oh wait you didn't bet on Dipper jump on the diving board so I still got your chair.
Stan: What you little lair.
Gideon: Don't touch me or the lifeguard take you back to pool jail. (Stan Groan.)
Dipper: Mabel you want to join me and Wendy to play a pranks on Soos.
Mabel: No thanks I catch up with your guys later.
Dipper: Okay (Dipper about to get out of the pool.)
Mabel: and Dipper thank for helping me overcome my fear of heights.
Dipper: No problem Mabel we always help each other. (Dipper get out of the pool and Mabel swim back to Mermando.)
Mermando: Wow! I got to hand it to you, Mabel, that was a heck of a dive. I never see this jump before you're really a brave person I ever seen.
Mabel: oh Really oh Mermando (Mabel crushes Mermando in a hug.)
Mermando: You are covering my gills again. (Mabel quickly lets go. Mermando gasps.)
Mabel (Chuckles) Sorry.
Mabel: So you want to climb out hair.
Mermando: Of course ( Mabel and Mermando brushing each others hair. So Mabel overcome her fear of heights thank to her twins brother Dipper.)