I have fun with the ones who call up to "talk about my recent accident as they can get me a significant payout" I let them speak, then when they ask "were you injured" I say "oh yes, very seriously". This gets them excited and they blurt out a load of other nonsense before finally asking "what was the nature of your injuries?" To which I reply, " oh well it's very sad, they took me to hospital, thought I would be ok but then sadly I died"... Then I either just go silent, or play along some more to see how much longer they want to waste talking to a dead person.