Mistakes I've made playing Eve that I'll never forget:

Jumping into Low Sec in a Raven to do a mission........oh! So THAT is why you don't do that.

Being talked into hauling POS equipment through Null and Low sec....in Badger.....as a noob player.....(actually made 2 round trips before being popped).

Lag in Jita can cost you a LOT of ISK.

Forgetting that my Tengu speed tanks........not perma boosts when running a level 4 mission, after argoing the entire room.....oops. There's 360 million down the drain....

Undocking in my mission fitted CNR during a war dec........uhm, oopsy! Hey guys? Yah you guys trying to kill me, yah, uhm, I forgot I was in my CNR, could you let me just dock and get my pvp ship? Stop drooling, uhm......crud..........

Using Autopilot.......at any time.......(seriously? you suicided ganked my shuttle? for godsake, WHY? I didn't even have implants!)

Being bait is not so bad........unless you're being bait at the WRONG low sec gate camp........