Guy plays Firetruck game with girl

Boy to Girl: Lets play new game today called "Firetruck" Game

Girl: I have never played this game. How to play it ?

Boy: I run my fingures up on your legs. And you say "Red Lights" when you want to stop me

Girl: OK

After few seconds

Girl: Redlights !!

Boy: Fire Trucks do not stop for red lights

Ha Ha Ha Ha

Please comment.