I teach 2 year olds at our church's Mother's Day Out program. When we were studying the letter 'M', I thought it would be cute to have a mustache for them to wear if they wanted to (I also made extra for me and the other teacher to wear). When I was making them, my boys were so excited and wanted one. So I let them pick what they wanted and made some more for my class.
I had to get some pix. Very fun!
I found the free pattern here.
Just takes a minute and a scrap piece of yarn. Great way to use up those yarn pieces that are not long enough for anything else.