A blonde sits in the dentist chair, dentist pokes around, scrapes a few teeth, and says "this one needs filling". Blonde says "how do you know?" Dentist says "because I am a dentist and you are not". So blonde says "go ahead and fill it, see if I care" Dentist says "no need to be so aggressive, I wasn't suggesting that you remove your underwear, just that you need a filling". So the blonde says "oh alright then"
Actually, there is quite a bit missing from that joke, but being the puritan that he so portrayed last night, after a bit of a rude joke I posted, I don't think he would print the full version.