What games do you find hard, and sometimes annoying?

If i thought for awhile i could probably make a list of twenty but here's a few off of the top of my head:

KIRBY TILT N TUMBLE GBC
Wario's woods SNES
Ghosts n goblins NES (although very very fun)
Blast corps N64
Contra 4 DS

I Wanna be the Guy, of course.

Professor Layton is pretty challenging too, but not hard to the point of frustration.

Battletoads >_>
Morrowind/Oblivion on Very hard mode
CoD4's Mile High Club on Vet. (but i beat dat)
Goemon's Great Adventure was awesome but fucking hard as shit.

Ridge Racer. >.>

Holy Invasion of Privacy: What did I do to deserve this? After level 5 the game has a learning curve harder than Everquest.

i cant believe no one's said R-type yet...
http://en.wikipedia.org/wiki/R-Type
in all my years... i could NEVER beat it

Romancing SaGa 3. The amount of time you spend powerleveling is immense and you're pretty much forced to do the sidequests or you're fucked. Not to mention your character's stats are static and never change. And trying to learn multi-attacks for Commander Mode is a chore.

Any game in the Fire Emblem series, but only if you try to do it without having anyone die.

The Megaman series. These even have a reputation for being hard.