A couple years ago, I thought it'd be hilarious to put up some rare postcards on Ebay and then mail them the postcard. As in, not putting it in a protective wrap and a padded envelope, but actually mailing the postcard.
I did this and here are the pictures from it:
The sad part is that Ebay canceled my account (for unrelated reasons) just as the postcards were arriving to these people, so none of them were able to contact me via Ebay and yell at me about the postcard thing. Which was the whole point of the prank, pissing people off. So recently I dug up a bunch of old postcards that could be considered rare and I placed them on Ebay. A few of them were won and I'm going to do it again.
As you can see from the postcards I did before, all I did was thank them and ask them for good feedback or whatever. I should do something different with these postcards. I was thinking of cursing at the winner a lot. Give them a good verbal lashing. Or maybe saying mean things about their mother. I really don't know what to write on them. So that's why you people have to give me some ideas.