There's a fair few things that I reckon should be lost for all eternity. Here goes:-

Idiots who think that people of my age group (under 18) are not worth listening to (see isms)
Osama Bin Laden (for obvious reasons)
Anne Robinson (cos she's a [censored!])
Myra Hindley & people like her (again for obvious reasons!)
Politicians (they'd have problems in the Jim Carrey fil "Liar, Liar"!)
Nasty teachers (like my GCSE History one!)
People who are really perky first thing in the morning (for example one of my A Level German tutors)
Bob The Builder (just cos I hate him)
Over 30s releasing pop records (but I'll let Madonna off, cos she's cool, even though she is forty-odd!)
Sexism (obvious)
Racism (obvious)
Any other forms of derogatory isms (obvious)
People who think my age group shouldn't know such words as "derogatory"!!
Whoever thought up the AS Levels!
Dave Benson Phillips (British children's presenter, very annoying)
Cartoon characters releasing records (except Gorillaz cos they're not cheesy!)
Spam (both junk emails/text messages and the food)
Green ketchup (looks like slime!)
Mushy peas (more slime!)
Spiders (I hate them)
Slugs (horrible)
Maths GCSE (or any form of Maths exam, especially for people like me who are rubbish at it!)
People who speak to under 18s as if they are thick or something (or just generally patronising people. I've come close to hitting people a few times for that!)
Internet service providers who kick you off the web when you are posting something fairly long to Mudcat (as has just happened!)
War (obvious)

There's lots of other things but I've decided to cut a long story short, as it were.