those ones that look like they have been made on a £1 budget, the elephant.co.uk ones, diamond, windows thingy.
Others like the bloody B&Q ones really riles me, McNasty's is terrible.
One that really gets me is the specsavers one, where the dad loses his glasses 'but mine are vary-vocals' wanker
Saying that though, one of my favourite are some of the recent car ones 'Isn't nice when things just work' and 'Cog' both for honda (even if cog was a complete rip off from an unknown film-maker. (swedish i think he was)
Honestly people, adverts are a chance to express your creative juices, people get paid thousands to think these up, and they look like they have been done by a 5 year old who did the story boards while smacked out of his head. How do some of these people get jobs.