I was traipsing the dungeons with a serious case of Your Inventory Is Full disease. Dual-Wielding melee roguey dude with high trap sense - I had picked up every trap from the ground for 3 or 4 floors. Stacks of them occupied a row or two of my inventory. I saw my first ever Mysterious Portal. I figured it was probably dangerous, but exciting! I walk in, begin to duel, dodge a few hits, the massive diggle's health bar sure seems to be moving slowly. WHAM! he hits me for 30% or so of my hp! Crap! So I Knight-teleport away and search frantically through my inventory. Hey look, a bunch of traps! I proceed to teleport and trap and run for about 30 turns, eventually killing him. Massive experience points! And I see loot in the room! And it's awesome loot! Oh and a smaller diggle. I'll go beat it up. WHAM! This one hits me for 40% of my hp! Size doesn't mean everything apparently. I proceed to dump traps all over the floor yet again... and accidentally walk on to one. YAFD.