The hilarious part is how Cell said the Cell Games would be a hashtag on Twitter and Yamcha said it was already trending. After that episode's release, the #CellGames really was trending on Twitter.
Cell in general was just done so perfectly. From his intro scene creepily singing to himself when Picollo hunted him down, to that argument he had with all the people in a city before he blew it up... Amazing.
The connected reoccurring jokes are just fantastic.
"How did all these squares make a circle!? I just--no, no, it's fine, it's fine, it doesn't bother me, it doesn't bother me... it bothers me, it bothers me a lot--AND THAT ONE'S STILL GREEN!"