Tried to retract the bipod on the Mosin whilst on a ladder (odd, I know) and died. Don't know if this is when any inventory item is used or just the bipod, have not had the time to reproduce.
Video at http://youtu.be/70MnrH5hSBw
(I know there is a primary ladder thread though that seemed to be about falling off the ladder rather than dying whilst on it. Apologies in advance if this was supposed to belong there.)