Escalator joke

I couldn't fall asleep (or "fall to sleep" as Breanne says) the other night so I tried making up a joke. I came up with a rough idea about an escalator filling out one of those forms at school where they ask you who to contact in case of an emergency. I thought that, logically, if an elevator and a stairway had a kid, it would be an escalator. I'd seen one of those signs that reads: IN CASE OF EMERGENCY, USE STAIRS. I thought there was a joke in it. Nope.