Say thank you, give you a hug, and go off to see a movie, probably.
There’s a big book sale this weekend. Saturday morning, $20 could buy 20 books. Sunday evening, it could buy 20 bags. By Monday, it would be unnecessary.
There’s a few DVDs I want. $20 might buy one, if I pay for the postage.
I’m on the look-out for some nice old light fixtures, maybe something from the '30s. At a flea market, $20 would buy a three or four nice sconces. At an antique store, it would buy one or maybe a pair.
There’s a few interesting items I’ve seen here and there at junk stores and on eBay. Useless crap, really, but I like to call it objet d’art. $20 could buy some of it.
Or I could squirrel it away in my Empire fund. I hope to one day buy a few hundred acres of cheap woods up north and make it my empire. I would be all alone with a happy little house in the deep woods and it would be just like a Bob Ross painting.
Buy a couple misspellings of the domain I’m going to use for a new website.
Misplace it.
Stick it down the G-string of some 18yo up at the booby bar.
Meh, easy come easy go…
Stick it in my wallet and forget about it, thus allowing me to postpone my next trip to the ATM by a day or two.
If I remembered it next time I was at work, I’d probably use it to justify my going home an hour early that night.
I’d buy some books. Of course, this is pretty much the answer I give whenever I find that I have extra money. . .
Say, “Thank you,” and save it.
Don’t need it, don’t want it. But if you insist, probably hand it to the first homeless person I see.
I’d put it in my gas tank. I’m nearing “E,” and payday isn’t until Tuesday.
I’d go out for a drink or two Friday night. I deserve it - finals are coming up and I need a chance to relax a little first.
What to do with an imaginary $20? hmmmm…
I’d buy film for my digital camera.
I’d buy scratch-off lottery tickets. Two ten dollar tickets to be exact
Give it to PunditLisa. 
Duly noted. I bet George has REALLY droopy balls anyways.
Well, I guess I’d take it…put it in the bank…allow it to earn .02 of interest, then pay for a sdmb subscription…
I’d have a little left over, so I would buy an expresso…cause man, that stuff is goooood…
Count me as another who would buy a book or books. I can’t help it.
Several years ago, there was a popular morning DJ (Ron Chapman) in a major metropolitan market (Dallas - Fort Worth) who asked on-air for listeners to send him $20. He gave no explanation, didn’t say what he would use it for or where the money would go, and he insisted if $20 was a hardship for you that you not send anything.
Such was the power of this man’s personality and the love and respect for him by the community, in very little time he’d received $240,000 that he distributed to local charities.
I thought I posted this ealier but I guess not at all 
I would subscribe to the SDMB…heh…then buy an expresso…
yay coffee!