Yeah, a friend's mother told me that one about a month ago when trying to make me eat breakfast. (Eating first thing in the morning tends to make me ill.) The cite she gave me was "my aunt, who was a nurse." It didn't sound medically plausible to me.
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Gillian
"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"
"You can't erase icing."
"I can't believe it doesn't work! I found it on the internet, man!"