I was sent this LINK that highlights coasters made up of out-of-circulation currency. It would be kinda money to throw one of these down on the table. Class it up a bit.
Actually, my first thought was dissecting them with water, patience, tweezers and an eleven year old. And then promise them a 50-50 split if they can put it all back together again. Exercises in futility are kind of my specialty.
And side note: Happy National IPA Day. To the men and women who clearly have desensitized or completely numb taste buds. :)