Teleportitis

Teleportitis is an intrinsic that allows you (or forces you, depending on your viewpoint) to teleport randomly every few turns. It may be gained by eating a leprechaun, nymph, or tengu corpse, or by wearing a ring of teleportation (these are often cursed, so be careful).

Teleportitis is infinitely more useful with teleport control, from a ring or an intrinsic.