A guy, we'll call him Thom, showed up for an SCA war, but had forgotten his helmet. Fortunately he was able to borrow a helmet that fit him nicely!
Well, ok, so it didn't fit him quite so nicely. It fit him a tad loosely. To be completely honest, it kept twisting on his head just a little bit at a time so that he had to keep righting it.
But no matter. It worked.
Or that's what he told himself.
Thom was running from one end of the field to the other at one point, and the helmet moved just enough that he was able to glimpse something out of the corner of his vision. He decided it was an enemy, and so WHACK!!! He hit it with his practice sword.
...when a referee came to stand over where Thom, who was now lying on the ground, this is what the ref told him: "I have good news and bad news. You're dead. The good news is that the tree is also dead."