You’ve just got to love this. Steve Wozniak uses a pad of $2 bills in sheets as spending money. It is real money, but perforated and glued on top like a regular pad of paper. See the interview and read Woz’s own account for how he uses these for laughs.
You can buy your own currency sheets in many demonations ($2 ones are sold out right now), but unless you have deep pockets like Woz, it isn’t practical for most people. One thing is for sure – Wozniak sure has a creative mind. No wonder he is so successful.