One of our waitresses took some meals out to a table and one of the guys was quite plump. There had been a little delay so she said 'I'm sorry about your wait', One of the guys said something back like , it's ok he's been fat for ages so is used to it.
Worst one I did was when selling cars, I asked the chap was his mother coming for the test drive as well. It was not his mother but his girlfriend as he pointed out.