First I'd heard about "renting a machine gun", a local range was doing it. Back in the late 80s. 25 dollars, and that included one magazine loaded with 25 rounds. Didn't matter if it was a 30-round stick or a 32 or whatever. You got 25.
Any addition rounds had to be bought from them. Not just "factory", but "bought from them". And since, at the time, I was buying S&B 45 ball for less than 8 bucks, and this range was selling it for 20, I decided against it.
I was in my local gun-pusher's one day (15 years or so later), and heard pow-pow-pow-pow-pow. And then nothing for a little while, then pow-pow-pow-pow-pow again. I asked what was going on, and he told me that a preacher from Georgia had come down on vacation, last year, rented a machine gun, and when he got back home had told his flock about it, and insisted that if they ever made it down here, they needed to come here and rent a machine gun. Fun, Fun, Fun.
So these two little old ladies - members of his congregation - had taken his advice. They had rented an Uzi and bought one box of ammo, and loaded five in the mag, and one lady fired 'em - pow-pow-pow-pow-pow. Then they loaded five more, and the other lady took a turn - pow-pow-pow-pow-pow.
They swapped back and forth until the box was empty, then came out, all smiles, gave him back his gun AND they had picked up all the empty brass and put it back in the Styrofoam tray and put it back in the box. They said the preacher was right - that had been quite enjoyable.
And then they left.
My gun-pusher tossed me the box full of empty brass, and I went and throwed it in my truck, and then went on home myownself.