Most dick move you've ever witnessed in Norrath?

[Bardalicious]

Some halfling used to sell Paw of Oppala on Rallos Zek circa 1999 and swap in a regular gnoll paw right before accepting the trade.

Similarly there was a gnome on Fennin that era named Demodren that would pull similar shenanigans.

Moral of the story? Don't trust shorties.

I think the one that takes the cake though is the any number of RL wives or husbands that played with their significant other that everyone else in the guild knew was cybering other people behind their back.