Why did the cops come over?
Because parents had kids in their basement.
Alright listen up buttercup, so the joke plays on the dark idea of parents keepin' their kids locked up in the basement. You see, cops showed up 'cause somethin' ain't right when folks are livin' like mole people. Jokes like this make light of messed up stuff, which might fly over your head since you ain't exactly known for your smarts.