On a rec day I was at recently with some first-timers we played a single flag game (in the centre, H-shaped barricade) and having walked the field on the way to our "base" I was convinced we were closer to it than they were, and had a much easier run, to the extent that I thought I'd just run full pelt at the flag and grab it at the beginning: what I hadn't noticed through my fogged up site-goggles was that my route went straight through a rather thin tree!
Needless to say I ran at full speed into this tree, and I swear it felt like my forearm had snapped... but as it happened, I had enough momentum to completely level the tree, get to the flag, grab it and then get stuck behind a bunker for the rest of the game...
It *was* an impressive bruise, but thankfully, nothing broken