I was walking, and for some reason, I got this message, "You attempt to walk, but trip and fall on your face."
Why did I trip!?
Perhaps you ate or drank something you shouldn't have or you were the victim of some magickal curse.
type 'score'
if that doesn't help, seek out the authorities
You're drunk.
It will give you more information about your character's current position and status with the commands 'stat' and 'score'.