2 New eBay Scams

Well they are new to me. First one goes like this somebody emails you saying they are the high bidder, They pay you Ultra Fast-saying send me the item ASAP. (they may even say I'll pay extra for a rush shipment. Meanwhile the real bidder may not contact right away and you sold the item to the wrong person.
OK the second one goes like this, Someone emails your high bidder sells says they are you and makes a deal behind your back. meanwhile the unsuspecting buyer gets confused as to who who especially if you have contacted the buyer, the second one may not be so new - but the first one I have not seen until this past week. I hate to give people who may be reading this new ideas but in the words of Homer Simpson " Dam That eBay!"