Spent a few days at the Excalibur in Vegas recently. I never play slots (my wife does though), but on the last evening I sat at a Flaming "7" Double $1 machine and threw $20 in it. I started by betting the max $3 per spin thinking it would be over soon. I hit $300 three times and was about to quit, but decided to keep playing.
About 45 minutes later, I hit two 7's and a double which is a $1000 pay out. Had it been two flaming 7's and a double it would have been a progressive payout of about $10,000.
Anyway, I immediately cashed out and for my $20, I ended up with about $1,880 or $1,860 to the good. Gave my wife $500 and gave most of the rest to Georgia Gun Shop for two HK VP9SK pistols.
Best win I have ever had while playing slots.