Watching Alexis and her Mini-Con friend (covered in a ridiculous amount of clothes to try and hide her appearance) go shopping. Amazingly, only a child in the store notices something's up.
Megatron linking up with his Mini-Con Leader-1 which makes his cannon so powerful each shot sends him flying, at one point he FALLS flat on his back and his cannon is still firing!
In the episode "Rebellion" the lack of moral at Decepticon HQ makes Demolisher worry. You know the Decepticons are in trouble when he starts to consider that Cyclonus is the only sane one.
Demolishor: What is going on with everyone here? Ever since we lost that battle, everyone's gone loopy. (glances at Cyclonus, who's still sleeping and snoring) Well, at least some things never change around here. But Cyclonus is starting to look like the only sane one.
Thrust's nickname, "Squidhead".
Megatron and Thrust's fight in "Crisis".
Side Swipe chasing Hot Shot around the Autobots' command center for a hug. The expression on his face when Side Swipe catches him is priceless.
"MY BUTT! WHAT HAVE YOU DONE TO MY POOR BUTT?!"
You have to love everybody's uneasiness at the start of the first Autobot-Decepticon alliance. Watching everyone greeting each other and shake hands is hilarious beyond words.