Oh yes, then you'd know to avoid him until the button came off!
Men have such a button - but it is designed to be handicap accessible. All you have to do is touch a man and the audible alert goes off. Emitting the famous (grumble ...grumble) NOTHING! (grumble ... grumble).If the alert doesn't sound, it is safe to proceed to conversation.
I HATE it when I know something is bugging my hubs and he says 'nothing' when I ask what's wrong. I need one of those buttons too. or a stamp I can put on his forehead to warn every one around him.
I think my husband takes so much crap at work that by the time he gets home he's ready to explode...and when he's in a mood...WATCH OUT!! I tell him if he acted like such a brat at work they'd fire him.NOT a good thing to say.