I always have a blast.
On a recent visit around Thanksgiving, I spotted a Lord of the Rings slot machine in Caesar's. I knew there were Star Wars ones in the airport too, and I figured there had to be more around the strip. So to add fun I made a game of looking for machines with geeky themes. It was a way to break up the monotony of strolling through casino floors - that part of casinos tends to look the same no matter where you are - and I spotted more than I figured I would. I slacked on making note of where I saw everything, but I think slots move around anyways so the list probably wouldn't be accurate for long.
This Lord of the Rings machine was the one in my hotel, and it proved to be the luckiest. I kept getting bonuses, so it gave me the longest game play too (you know, out of the whole three slot machines or so I played). There was a map, mini movies, and the chairs moved. I wanted to bring it home with me, but I settled for the $50 or so I won from it instead.
All in all, I came out $5-10 ahead. I can see the appeal, but I'm still way too attached to my money to let much of it go.
While I was tweeting my geeky slot machine pics from the trip, I heard rumors of a Stargate: SG-1 slot and an Indiana Jones one, but I didn't spot either. Have you seen more in Vegas that I didn't show?