My wife went to a couple slot tournaments on our last visit to Vegas.
I think my boss was also in the Mirage slots tournament a while back too.
All I can think of for that tournament is, 7, 7, 7.
You know you want them, 7, 7, 7. Get them all and you get extra coins, 7, 7, 7.
On and on and on. I've got it burned in my brain now.