None of these characters are mine. All Jk Rowling's. (I just own the yoyo's).
Yoyo
Hermione Granger and Dean Thomson were huddled in a corner talking. All of a sudden they both turned around, and put string on their fingers. They both said "1,2,3" then dropped a ball that was on the end of the string.
Some of the purebloods, like the Weasleys, Brown, and Patil looked at them with confusion on their faces. Harry jumped up with a smile saying "you have a spare?" then Harry joined in as well. All three of them started to do tricks.
Finally Ron yelled "how do you do that?" and Hermione responded, "It's a muggle toy, called a yoyo." Patil and Brown looked away at the word 'muggle', but Ron just stared in confusion.
Then Hermione, Dean, and Harry all pulled their yoyo's back into their hands, and screamed "YOYO TIME" then through smoke down. When everyone vision cleared, the three of them were gone.
Outside the portrait hole, Hermione, Dean, and Harry were laughing.