I particularly liked this one from a seller early last year...

"Any Faster With Payment & The Speed Camera Would Have Caught You. Thank You"

Another two I received last year, also as a buyer...

"Words cannot express how amazing this buyer truly is! Awesome!!!"
"Please please please come back again! You are so awesome!!!"

And no, I've no idea what the hell he'd been smoking. 🙂

What I did notice as I went back through several years of feedback was the large number of both buyers and sellers who are no longer registered users. Some of the sellers were fairly high-volume traders as well. Rather sad to see them giving up on eBay (or being forced to, more likely).