My informant was told this by a friend when she hit her funny bone and held it close to her side.

“If you touch your elbow after you hit your funny bone, you will lose money”

Her friend was from Mexico and said she learned this from her mother.  My informant was a bit confused by this advice.

This belief might be because holding your elbow after you hit it could be counterproductive, like it bunches up the muscles which make it take longer to stop hurting.  Also the threat of losing money reveals that wealth is very important to the community that the friend came from and can be used to prevent certain things.