That's not funny.
Should it really be a lightbulb?
Two. One to change it and one to yell "Ta-daa!" when he's done.
Only one but it takes eight million years.
Lets go play on our bikes.
He's never met a woman he hasn't knocked out.
Because women can't drive.
Red, white and blue
If she's only wearing one sock. (This joke brought to you courtesy the homeless guy outside my local 7-11.) Edit: tweaked the punchline.