So, I forgot the name of this anime, but it's definitely one of my favorites.

The main character, a man, was found in a forest by a young women with cat/fox ears and tail. She takes him back to her village where she takes care of him until he awakens. The 2 go for a walk somewhere, in which the man decides to grab the young women's tail. First, she's surprised, then has an "Ahhh... :3" look on her face, then freaks out and pushes the man. HILARIOUS.
Skipping ahead a lot of episodes, a war has come, and there are people controlling robots. The young women and man are trapped by a robot. Just as the man gets stomped on, he turns into some kind of monster alien thing, the same size as the robot. After a butt kicking, the guy in the robot runs away crying, "Mommy!!" HILARIOUS.
Thus ends my explanation of this anime. If you know the name of it, we could be the best-est friends ever! :D