BTDT, got the scars from the operations to prove it. Went to step on the gunnel of a ski boat I had many moons ago. It was tied between several other boats at the time. As I stepped down from a small cruiser, someone jumped in my boat coming the other way. My leg went off the edge and down between the boats. My body unfortunately continued on into my boat where as the big POP sound was heard from my knee. ACL go bye bye.