My friend lost a bet. Punishment? ?

One of my closest friend has lost a bet to me that we were agreed upon the loser had to do something embarrassing.
Fortunately for me she lost, so I secretly asked her mother for ideas to find out what she doesn't like. She told me that her daughter is very shy about her feet being seen by strangers.
So as punishment for the bet, I’m planning to make her spend a day in a mall but she must go barefoot throughout the day.
What do you think about this idea? Is it too cruel? Can you think of something else to spice it up?
My friend lost a bet. Punishment? ?
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