I find it amusing the way our cat "asks" to come inside. I'll be watching TV, and he'll tap on the window to my right. When I turn to look, the cat will be looking straight through me with an, "Open the door, Lunkhead" look on his face. Cracks me up.

I don't know how he learned to tap the window with one claw--but it's the same sound my grandmother used to make when she'd tap on the car window to tell my mom where to park.