I was going to suggest Where’s George too. Additionally, once you register them, turn them into moneygami and leave each one in a random spot for someone else to find. Then see if they let you know how they found it via Where’s George.
Successfully? 
I agree, obviously… 
Joe
Nah, with 20 bills, she’s gotta make it rain.
Scrape all the cocaine off them and have a paaartaaay!
Oh wait, that only works on hundreds.
Probably not so well if they are the kind you find in the maternity section… 
I can neither confirm nor deny anything.
Now we know there are at least three of us here.
Never mind the variety. Focus it all on 2000 pieces of penny candy.
Hang them from a tree.
Change them into quarters. Put them all into a piggy bank for Mouselet.
Oh cool - I’ll have to try that myself!
I jumped into the thread to suggest Where’s George myself. Great minds thing alike. I’ve actually gone so far as to spend money to get a rubber stamp, rather than just handwriting on them.
Culrure Jam the mint!
Get a 40 point stamp of the word “COUNTERFIT” and stamp em. Spend with stamp down. Repeat as needed!
FML
If they’re fresh, crisp one dollars bills get them padded. We like to do this when going somewhere for vacation. It always freaks people out when you pull a fresh one from the top of the pad. “Where do you get those?” Vary your response to confound your local bank, the Treasury, or the FBI.
Who would go that far?
You can buy lunch for three people, sandwich and soda only, at the captive clientele cafe across the street from my office.
Well, you’re pregnant so you can go ahead and practice this:
Take $8 out and give it to the manager of Wal-Mart.
Take $5 out and give it to the receptionist at a pediatrician’s office.
Take $2 out and give it to the pharmacist.
Take $3 out and just tear it into shreds because there’s always something.
Wipe your butt with the remaining $2 because that’s your emergency diaper money right there.
At the place across the street from my office, you can feed FIVE people ($3 sandwich, $1 drink). Good sammiches too.
Burn them! Burn them all! BUUURRRRNNNNN!!!1111