The METRA commuter trains to be specific.
A young father holds up his infant son and says the following between spurts of giving the child rasberries (putting lips to stomach and blowing):
"Are you gassy like daddy? Are you gassy like daddy!?"
Mixed in were other great lines like "Did you fart? Did you fart!?" and "Did you drop a duce? Did my boy drop a duce!?"
Truth. I Swear.