Since these lists were pretty short before I began proofreading them, I'm giving you two characters to annoy instead of one. Enjoy!

R2-D2

1. Call him a malfunctioning little twerp, an overweight blob of grease, etc.

2. Use him as a vacuum, fire hydrant, or trash can. OR

3. Replace his arm with an Infotube and use him as a real estate "For Sale" sign.

4. Imitate his beeps, whistles, and bloops.

5. Tell everyone that he proposed to a fire hydrant or a mailbox, whichever is more accessible.

6. Call him "Arturito".

7. Use him to charge your phone, and tell everyone else that he makes a great charging station!

8. Tell him to stop being so vulgar that his programming has to bleep out every word he says

9. Replace his voice with BB-8's, Gonk Droid's, you get the picture. Blame it on the last time Luke tinkered with him.

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C-3PO

1. Call him a mindless philosopher.

2. Walk up to him and say, "Hi Legolas! Why don't you look like an elf today?"

3. Cover his mouth when he tries to talk.

4. Tap him repeatedly on the shoulder after telling him to do something so he keeps having to turn around.

5. Hide his real arm so he has to wear his temporary red one all the time.

6. Take him with you to an amusement park and ride on all the crazy rollercoasters and swings! OR

7. Take him flying around in hyperspeed or through an asteroid field. If you can't convince Han to lend you the Falcon for a while, there's always me, El Droide, a little old airplane, and bumpy weather to help out!

8. Replace his voice with a battle droid's.

9. Say "echuta!" whenever he comes to talk to you.

10. Use him as a mirror, or give him away as a "full-sized Oscar award".

11. Replace the lightbulbs for his eyes with red ones to make everyone think he turned evil. Or you can replace them with colorful, blinking ones!

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For Both

1. Leave them alone around Jawas or Ewoks while you "run an errand".

2. Take them with you to every cantina you see, and ask the bartender if they serve food and drinks to droids. Make sure that R2's tasers are disabled and that Threepio isn't armed though, because they will be pissed off after all that.

3. Stick colorful alphabet and number magnets all over them! If you want to get really creative, tape your and your younger siblings' (if you have any) drawings to them as well.

A.N. Those poor droids. They will need nice oil baths after all these pranks. In case you're confused about #2 for Threepio, Anthony Daniels voiced Legolas in the 1978 Lord of the Rings animation, which is pretty neat. It's also a bit ironic too, considering that Threepio apparently uses Chewie's bowcaster in TRoS (I haven't seen it yet, but that's what I heard). Anyway, there will be more crossovers, so don't get too comfortable!

DawnDayrider: Probably, not to mention that doing that has a 98% chance of getting you killed. XD

HostileOnTheHill: Thanks! I'm glad this makes you laugh.