While I'm not able to do impressive feats like the recent incident when a level 80 Paladin took out some bosses of Mogu'shan Vaults (despite the exploit involved still not easily doable) I like to tackle old bosses alone.
I don't collect buffs from other classes, I don't use bufffood, flasks, pots or the like. I do it rather casually, for fun when I'm bored. Today I discovered that I can take on the first two bosses from Wintergrasp in 25 player mode. The first one, Archavon, was not a huge surprise since he was easily soloable in 10 player mode at 85. The second one, fire guy, was not very hard either. I just had to watch my health and step out of the fire he occassionally slings at the floor. Just from the mechanics I think the other two might be a bit two much right now, given my gear- and skill-level. I plan on trying them this ID in 10 player mode to be able to gauge the strength they will have in 25 player mode.
Other than that I kill Attumen each week and now and then throw in a quick Stonecore double run (nHC + HC) till the second boss for the mount.
Oh and I do Molten Core each ID on my 86, soon 87, warrior.
Do others here solo old stuff on a regular base? Really hardcore, like some 10man bosses from Cata already or more laid back, like I do?