Sure, but your hilarity may be coming from someone else's tragedy (or certainly something they probably don't consider funny), and maybe you're not being loud y

Sure, but your hilarity may be coming from someone else's tragedy (or certainly something they probably don't consider funny), and maybe you're not being loud you're just sat somewhere you can be overheard? And again - sharing the conversation you've overhead is unlikely to be a selfless act, is it?! That said, horses for courses - we can agree to disagree :-)