Haha I got one of those earlier this year UT.
I had a bow for sale in the classifieds for $350 shipped in the US and a guy PMed me and said he would take it for the price I had it at. I sent him a reply and said it was his because he was the first to respond. Sent him my PayPal info. He sends another message saying "oh yeah, I'm from Canada, is that a problem". I told him that it was because I didn't want to ship out of the US and would have a lot in shipping cost. He responded...said he would pay the shipping on it if I would ship to Canada for him. So I had no problem with that. I told him I would get a shipping estimate for it and let him know what the total was.
So I did that...was gonna be about $50-$55 to ship to him. I sent him the total...and he then started trying to back track...saying that the bow was $350. Yeah...it was $350 shipped in the US but he wanted it for $350 shipped to Canada, after saying he would pay the shipping on it. Long story short, this goes on for about 2-3 days of him trying to get me to sell it for $300 and then with his added shipping cost, it being a total of $350 he paid for it. I told him no deal...he wasn't getting it for $300. I had several people wanting the bow so I figured I had wasted enough time on him. I went to the next in line...sold the bow fast...shipped it...done deal. WRONG!! Dude from Canada sees that I closed my thread and gets his moderator buddy in on it. He said I moved too fast on my decision to sell the bow to someone else. Say what?!!! I promptly told him the bow was sold...paid for...and shipped...and that if either of them didn't like it, I would get them a pacifier and bottle and ship it to them. Boom. Time out for a week. LOL