I'm pretty sure my 2 cats do a lot of sleeping while we're out - unless the doorbell rings or somebody knocks - then they're off like a shot!

You can literally see them burning rubber on the hardwood floor (kinda hard to get enough traction!), then bouncing off the walls as they turn the corners and one cat flys down the stairs into the basement and dives into a big stack of empty cardboard boxes left over from when we moved. The other cat flees in the opposite direction into the master bedroom and under the bed.

It's quite hysterical to see their reaction to someone at the door - I don't know why they developed such a crazy reaction!