Wandered into Merka's shop, started poking around, and noticed an active landmine on the floor. So, stepping carefully around it, I made my purchases and left.
A bit later, I heard an explosion and an item appeared next to me.
I went back to Merka's shop... it was empty except for Merka and his guards.
I can only assume a critter stepped on the mine, and the explosion broke a wand of teleport and teleported his entire stock around the level.
Good fella that I am, I've decided to go gather up his items and return them. I'm sure he'll pay me handsomely.
EDIT: Nevermind, I got killed in a very stupid way: Chucking axes at a golem, managed to hit the (formerly friendly) angel behind it which I didn't see. Angel proceeded to murder the fuck out of me.
"Put more stuff in the... thing where... more stuff goes in."