I was walking by Saturday just as this gal hits. There were no loud screams of joy because she was hyper-ventilating and her husband was enjoying the moment in between making sure she was OK. I'm no slot player but it looks to me like she was playing 150 credits on a penny machine.
Last summer, my wife and I were playing VP at Harrah's in St. Louis, and about 7 or 8 machines away, there was a gal playing "Cave Man Keno". The background audio of that game will drive you nuts, but all of a sudden she started screaming & screaming, "I won !!! I won !!! I won !!! How much did I win ?? How much did I win ?? I think I won $5000 !!". And the screaming went on & on .... I don't play keno, but I decided to walk over, and see what she hit, and discovered that she was playing 10 numbers for quarters, and hit 7 numbers and 3 "bonus eggs" (whatever that means). I looked at her credits won (200,000), and politely informed her that she actually won $50,000. New, even louder screaming immediately began .....
Donk, Donk, Donk, Donk, Donk...Ay Yi Yi! That game was ridiculously loud there. And 3 Eggs is a 10X multiplier. And she was playing for 10 quarters, catching 10 of 10 with 3 eggs is 20000 for 1. http://wizardofodds.com/games/keno/appendix/2/ I'm also shocked that Playboy Platinum jackpot got that high as well, you can see that the reset is $7500 on the other unit in the picture.
The biggest I've seen was a bit over 12K in a Canadian native casino. You could hear the woman who won screaming from across the building.
I once won $13k on Bombay slot - but I was distracted by someone asking me a question and didn't even see the reels drop.