The Mastercard Ad...
... where a boy leans against a doorway and pleads with his date for a blowjob, only to have big sister open the door and say:

"Dad says, give the boy a damn bolwjob, but for god's sake tell him to stop leaning on the intercom."

Dad with a sense of humour ... etc.

Edit - may have been broadcast in foreign parts only.

Edit edit - see first reply for a better account of it.
( Ugi , it's a game of give and cake, Thu 15 Apr 2010, 16:22, 2 replies)

I saw it
but I dont remember if it was on youtube, or one of the even-shitter-than-Tarrant-on-TV Tarrant on TV rip-offs that flood Spanish TV during the wee hours.

And I think it was:

Dad says you've to give him a blowjob, I've to give him a blowjob, or he'll come down himself and give him one, just tell him to get his hand off the intercom!"
(bamboozled Can hear you getting fatter, Thu 15 Apr 2010, 16:28, closed)

That was it!
I knew there was a little more to it - I'd forgotten about the offer for dad to come down himself!

And it might even have been Tarrant on TV, 'cos I was known to watch that occasionally years ago *hangs head in shame*.
( Ugi , it's a game of give and cake, Thu 15 Apr 2010, 16:31, closed)

something a little like this www.youtube.com/watch?v=4JUIpln5m3M
(rikku_dreamer, Thu 15 Apr 2010, 16:54, closed)