I remember being 18 and going to Hooters with my best friend (yes Hooters, now shoosh). The waitress comes over and asks 'do you guys want to hear a dirty joke'. I looked at her and said 'no'. She stared at me for a second, then to my friend, then back at me. Neither of us laughing or smiling. She then says.. uhhh... okaaayyy... iiii'll.... think of a clean joke then! She stood there about 15 seconds without a word, then just walked off without even getting our drink order. hahahaha... It was classic.
A couple years later, we went back to the same Hooters, and i was with the same friend. By now we were 21 and he had started drinking again. When he orders a beer the waitress ID's him, naturally. He had somehow gotten away with making this goofy face on his drivers license picture. When the waitress saw it she started cracking up, calling other waitresses over to look at it. This went on for about 30 seconds, then she says she'll be right back, she wants to show the cooks in the back, and walks off with his license. He sat there trying not to look embarrassed, but i knew him enough to know he really was.
A few years after that i was with another friend who was overweight and referred to himself as 'Fat Guy'. We were in one of those trendy psuedo-metal/punk teen stores and one of the many 16 year old employees goes up to my friend to see if he needs help. He looks at her and says 'no thanks, i'm too fat to shop here, i'm just here with my friend'. The poor girl looked mortified. She walked away and we didn't see her again the rest of the time we were there. =D