I owned this effect for some time before I figured out how to use it. Sure, I pulled it out a couple of times in restaurants when volunteering to pay the bill, and I even took out some minature bills to get more laughs.

Now I have found a better way to use it. After milking all of the laughs I can from it size, I steal a "bill to giant bill" folded one more time than normal so that the billfold mostly hides it.

I show the dollar bill and unfold it to its regular size, and then say, I know this one dollar looks small but actually they are paying me big money in here, and I snap the dollar open to change it into a super-large $100 dollar bill.

What people often remember is that oversized hundred came out of a tiny little wallet.

Good for comedy magic bits or just for fun. How you use it is only limited by your imagination.