Isabella Will be Helen (animated)

I deliberately slowed down parts of this animation for effect - it's more hilarious when you watch it in slow motion. You see Isabella get carried away in the moment as she decides to be Helen and then grabs Phineas - and then she suddenly realizes what she has done and desperately tries to cover her mistake. It's pretty funny.

This is taken from the Phineas and Ferb episode "Troy Story".