I was changing my Brake disc's and Pads on My old VT... I got the left side done then started on the right.
I had this really big socket wrench and was trying to undo the caliper bolts.
I thought it was strange that it was still pretty tight and then SNAP.... I didn't know what had happened so I continued to take the second bolt off and then again.... SNAP...
then I realised I was doing them up instead of taking them off... oops
It was a little embarrassing when trying to explain to my mechanic what I just did but felt much better when he said he had done it before too...