It all goes dark when the train goes through a tunnel. In the dark there's the sound of an almighty slap, and when the train emerges from the tunnel the Texas Republican is rubbing his face, and there's a huge red mark on his cheek.
The old lady thinks "I bet that Texan fondled the blonde in the dark and she slapped him"
The pretty young blonde thinks " I bet the Redneck Texan tried to fondle me in the dark, got the old lady by mistake,and she hit him"
The redneck Texan thinks "I guess that New York liberal commie isn't a f*ggot, and that he fondled the blonde in the dark, but the blonde, naturally, thought it was me and hit me"
The New York Liberal thinks "I hope there's another tunnel coming up soon so I can slap that Texas chimp again"
(adapted from a joke circulating in email using an Englishman and a Frenchman.