It would probably be extremely annoying if I did this with other people....So I do not.... But I like to make up show tunes sometimes when I'm telling a story.. usually if it's about something disturbing. Such as years ago when an old client, aged 12, stomped on a baby bird while out with a staff.... Or i make them up for something that just sucks, like the one where I almost lost my job this year... Usually I only do this with my SO and one of my friends because they get it and will join in and sing along. But it started with the bird stomping.