Story is by a friend of mine, I wasn't there.
Their DM allowed for fumbles on skill checks and was always rolling the PC's skill check in secret.
Rogue has unknowingly fumbled a UMD check on a gate scroll.
Let your imagination dwell for a second on the infinite possibilities...
This guy, disappointingly, went for the classic "sucked into the void" option.
What would you have chosen?
I myself, was always partial to the positive planes "gain HP until you explode" theme.