Depends on where I put that trout. <GLARES>
You know, I’d buy a small radio station–then run it the old fashioned way. Variety of programs & musical styles, DJs, requests, etc.
For me, I’d buy, from the U.S. Government, one of their abandoned Titan missile facilities. I’d refurb the entire underground into a palacial dwelling. I’d use the missile silo as a multi-level garage with a bus-sized elevator going through the middle of it.
Just sayin’, is all.
When I eat out, if the service is good I usually tip above average sometimes up to 40%. With billions, I could see me tipping in the 1000$ range for good service, especially if the waiter is busting their ass during a rush.
That would be the only crazy thing I would do with that much money besides buy a couple of WWII tanks and park them all over the lawn.
Now I feel old, AND I have the jingle stuck in my head. Darn you to heck! :mad:
I’d sit and fold $100 bills into paper footballs and flick them across the living room.
When I got bored with that I’d buy up every other house on my block and have them all knocked down.
Now we’re thinking!
I’d make umbrellas, raincoats, and tarps out of the new plastic hundred-dollar bills by gluing them together, and sell them on the street for fifty cents. (“Don’t worry. They’re not real money; they’re licensed reproductions.”)
I’d pay people to inventory the locations and types of all the rocks on the beaches of the world, and build a digital model of them.
I’d buy the trademarks and processes for manufacturing obsolete, but not hip or retro-stylish, products and restart production.
I always wanted a jet with a full sized swimming pool in it.
Or, I could try running for president as an athiest.
Already available and you can get a nice one already furnished like it’s the Queen of Englands palace for a cool $5,000,000. This leads to the question of what will you do with the other $49,950,000,000? 
Buy the Washington Redskins.
New York subway tokens for everybody!*
*Everybody but New Yorkers, that is.