share the blame

Lol! A lot of times the punchline is as funny standing alone as with the joke preceding it. That way you can bypass the corny setup and just imagine it was smooth :P

"...and so the blonde said, I'm already done painting it. I had a lot leftover so I gave it two coats... and by the way, you don't have a Porsche, you have a Lexus."

Er maybe I was wrong :D

Reminds me of an old joke; I don't remember much of it, but I do remember the line, "Listen, lady, I'm not implying your son is stupid. I'm saying I don't know how he finds the front door every morning."