never had one stolen but in college the university cut my kryptonite 4 while I lifted weights. locked it to the wrong fence it turns out though it wasn't clearly marked. when i retrieved my bike from campus police I asked if maybe they could have just put a warning on it instead of destroying a 30 dollar lock. they laughed at me. I told them I was never going to give the college money after I graduated unless they replaced the lock. they laughed and said "you kids always say that."