Because the Mummy's always saying, "I'll be in the crypt tonight."
Alaska my mummy!
He was getting far too wrapped up in it.
Caitlin you my trainers tonight I'm wearing them!
Get your cap on the dentist is taking us out tonight.
Dad Jokes.
Wrong, Batman always wins.   Yes, I do have the sense of humor of a 5 year old.
Because he doesn't want to be around the crypt tonight. (you can tell i made that up)