How to get your friends to stop smoking

See the trick here is that you can’t just buy this and give it to them because they will just laugh it off and never use it. What you have to do is wait for them to come to your house and say “oh wait, let me get an ashtray,” and then nonchalantly pull this one out. The skull and crossbones is the first sign for them, but whenever a cigarette (or worse) is put on the ashtray, the skull starts to cough. That’ll teach ‘em. You can pick one up here for $17, and it runs on 2 AA batteries.

Source: Foolish Gadgets