About the stupidest thing you can do without dying...

[Bogatyr]

... is to cast "haste self" (m-d-c) in a major vault @ had cleared out just to see that "+45" show up in the speed column after picking up that second great speed ring. Only to get the message "You rise up through the ceiling". That sinking sensation you get in your gut, argh! I'd dropped my town spellbooks to be able to pick up the loot in the vault and recall, and ended up casting teleport level by mistake. I left the amulet of Ingwe, a sling of buckland, and a wand of annihilation on the floor. D'oh. Got the =Speed +13, though, and didn't lose any core equipment thank the Valar.