I Am Prone to Inappropriate Laughter

[b]Make it stop! [/b]

I don't know what triggered this weird tic, but it's honestly straight from the devil.

I have just been given some bad news, something the person was obviously & justifiably upset about. I could feel the corners of my mouth turning up, trying to smile. I had to turn away.

[b]Why?![/b]

It is just horrendous. Only started a couple of years ago & I cannot stop it no matter how hard I try.