They both spit.
We're both constantly penetrating your mom
Mom of kid: We don't believe in sugar. Me: I promise it's real. I've seen it with my own eyes.
The teacher says, "Spit out your gum," but a train says, "Chew chew!"
A school teacher tells you to spit out your gum, a train says choo choo.
Because it's Camel-flaged...
A palindromedary.