Yes, yes, I know it isn’t 4th Edition – but I love “Trap-A-Day”, and I got a good chuckle out of this.
An arrow fires out of the wall, striking you on the knee.
Type: magical; Perception DC 32; Disable Device 32
Trigger location; Reset None
The stricken character is affected by a geas to stop adventuring. See geas/quest spell for details.