Damn - I'm late to this thread so I think I've lost out on the Blue Geezer badge as someone has already mentioned the lard arses.
Smokers are net contributors - lard buckets are not.
But lard arses don't inflict their disgusting habit on others I hear you shout...true, to a degree, but speaking as someone who suffered a flight to Grand Cayman sitting next to a grotesque, smelly, sweaty, heavy breathing ton of blubber, there are times when their disgusting habit does affect other people.
Fat people are lazy - and before somebody nasally whines about fat people with glandular problems, I accept there are always exceptions to the rule - and as their laziness often manifests itself by the purchase of kilos of lard and sugar water from Greggs, KFC, McCrappy and the like, why not have a punitive fast food tax?
Smokers have a punitive smoking tax, drinkers have a heavy tax burden, drivers are taxed to the hilt, so why not have a fat barsteward tax?