I left my cupcake alone to print and when I come back, this is waiting for me…
Apparently Z stage raised itself from the nuts and started climbing…
Update: Seems that the filament got stuck to the cardboard box above and extruder started climbing when it couldn’t get more filament.

Wow dude, that’s painful. Any permanent damage?
my guess: Tower settings in skeinforge – while lowering to print something else after completing a tower, hot-end hit something, raising the z-platform, z-platform catches onto the threads… whoa
Spacexula, luckily no damage. Did not even strip the filament! :)