it happens to us too......
old lady, young guys (especially in groups)etc....
it usually happens when u wanna park ur car. it's like waiting for 'gold' and suddenly without respect,they just 'snatch'in d parking space that we'r waiting. snap, just like that!!
then we hv to find another 'gold', damn!!
when it happens,it really hurts, but after a while u just hv to forget and move on with ya life.

SMILE.......that's what we did. no point of being angry to such things, it'll just makes u look old!!