Even I know better than to leave my helmet on my bike...oh thats right I don't have a helmet I live in Florida.
 \\;
Still sorry to hear about your lid man.
I never sit where I can not see at least half of the bike. I will request certain tables just to see the bike. If the place does not have a way for me to park where I can see the bike, I get my food to go or I go. Sometimes we leave the helmets with the bikes if we are wearing them riding that day and sometimes we carry them in. Shooting punks in the back running away with your stolen helmet is still frowned on in Texas.
That sucks. However, I do have a half helmet (XXlarge) and \\;a 3/4 (large). \\; Both helmets are barely used, \\;you could have one. All you have to do is pay for postage, \\;let me know.
 \\; ElSexton