Once I put $100 into a $0.25 machine and played it for a while.  I played it down to zero credits, and then I hit Four of a Kind, which saved me.  I played that down to zero again, and then I hit Four of a Kind again.  I played it down to zero credits a third time, and then hit Four of a Kind a third time!  But that was the end of my luck.  I didn't get it a fourth time, I just went bust.  Still, that was pretty unusual.

A straight is a hand with consecutive ranks, like 9? 7? 10? 8? 6?.  Notice again that the cards don't have to appear in order.  The order of face cards, from lowest to highest, is Jack, Queen, King, Ace, which we abbreviate J, Q, K, A.  An ace can also count as 1, to complete a straight where the other cards are 2, 3, 4, and 5.  But it can't count as both a low and a high card, e.g., Q K A 2 3.