I’ve read some of the comments, I agree with the consensus on freerepublic they are not that uncommon, never the less one thing for you all to consider it could of been on of those really old ones from back in the 1920’s or so. I’ve got one has a date of 1928 on it, and it has a red labels or what ever you call them verses the green you see now days on the $2.00 bills. Hopefully the kid didn’t take the $2.00 bill out of some ones antique collection of bills.
Happens often.
Keep an eye on your change around Christmas. That time of year I always get something back in change (silver coinage, wheat pennies, silver certificates) that is fairly interesting. People clean out their dresser drawers, or pick through Mom and Dad's collection, or something.
Got a neat Standing Liberty quarter, and some overseas coins, last year. All from the same place. Made me want to paw through the cash register.