You know why the snake opened the door? Because the doorbell didn't work. Hey, I'm trying here. Exactly what do you say when a snake opens the door? I guess "OH SH@T THERE'S A SNAKE AT THE DOOR!" might be a good thing to say.

If my "snake spotting" skills are up to day, this is an Albino Burmese Python.  They are very popular among snake lovers.  How it learned to do this without having thumbs is pretty creepy.  Here you go: