I have a few times for the following reasons:
-I was eating. (seriously, I am not standing up and leaving my meal for a photo)
-I was on my way to another event.
-I was staffing and was "on duty".
Most people are pretty understanding and will either find you later or just smile and walk away.
...Or they at least walk away out of earshot before calling me a bitch..lol
I'm only a male lust object on the weekends." -Meng Xiaojie-
Common Sense isn't so common anymore. Perhaps it should now be called Rare Sense
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(Warning: I swear a lot..lol)