I’m sure this poor dude didn’t think in a million years his helmet was going to save him from becoming a vegetable, because of a hard charging Antelope!
http://www.youtube.com/watch?v=S2oymHHyV1M&feature=player_embedded
Or have your head stomped on by an elephant.
"So is it safe? Is traveling to the US which has thousands of armed robberies per year, safe? Statistically the answer is “in relation to what ?”. And what are the benefits versus the risks? But when you have a mother elephant cracking your helmet with your head still in it, is cycling in India safe? "
http://www.tourdafrique.com/blog/indianadventure/encounters-of-the-unwanted-kind
I’m already in the pro wear a helmet camp because it has the potential to stop my head getting cracked if I was to fall off my bike, but if I wasn’t the added benefit of it protecting me if I was to get hit by an overgrown version of bambi has me sold 
.