Having a dumb dumb girl friend has a lot of advantages, just don’t marry her.
You’ll be sorrrrrry!
Only dumb guys need dumb girls. Otherwise those guys would suffer from an inferiority complex.
No s*x today. Tomorrow he‘ll think of an even wittier punchline.
You see, sleep ends in ‘p’, she was referring to sleep, that is what is suppose to allegedly make this comic funny.