Animals vs Mirrors
Here's a bunch of videos of pets reacting adorably stupid to their own reflections.
I usually have a slightly less violent but equally surprised reaction to my reflection in the mirror.
Cat-Mirror Breakdance
Cat Almost Breaks the Mirror
Really Cute Golden Retriever Puppy Plays with Itself in the Mirror
Super Spastic Dog
Bunny Discovers Self in Mirror
"Quit Copying Me!" Kitten