On bored nights or just nights where I was feeling a particularly high level of angst, I'd log on one of two RL friends Druids and head to Qeynos. I proceeded to charm every animal in sight and give them thorns, chloro, SLN, etc. etc. and then zone. I did this for every animal in sight. I'd then watch all the resident newbies get rekt over and over again laughing so hard I was in pain
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I'd also get the Priest of Discord to attack guards at the lifts in Gfay and coerce the local newbies to help take down the evil Priest. Little did they know the Priest was a monster and after he finished slaughtering the guards, they were next.
Never did any crazy thievery in Everquest but lots and lots of training/trolling/tomfoolery. I still look back on it fondly, actually.