Hot/Odd/Stupid Customer interactions

I was volunteering with my organization and we were folding shirts. Right after I just finished folding a set of like 20 small shirts a guy asked do we have any in size large. I told him we were out and this pile is only small. After I set down the shirts and left he proceed to pull from the very bottom and knock over the whole stack of shirts just to throw the shirt on the new pile of mess he created. Worst volunteering EVER!!!!!!!!!!