Moonpig.com is by the far the worst.
Hearing it actually enrages me.
Never seen it or heard of it....they mustn't show it in this part of the world. Just looked it up on YouTube...ya, I can see that getting annoying pretty quickly....

The bad jingle ones don't really bother me....I just turn over.
Its the impossibly stupid ones that annoy me. Like the one where the guy is struggling to cut his tiny lawn, gets a big f*** off loan and proceeds to spunk it all on a massive ride-on lawnmower. Thick c***.

. And the "how much we borrowing? 25,000?", as if anyone is that blaze (sp?), and the ones where people get impossibly excited by the most inane things like giant HIGH DEF!!! posters of the Manchester United crest.
I'm offended that fictional people can be so stupid.
