We went through rolling d100 using three d10. One die determined which of the other two was the tens die. It was odd, but some people thought it gave them an edge and why argue with a harmless tweak?
Me: "Sweet! I rolled 18." Friend: "Er, that's 9." Me: "... shoot."
I'd have noticed it sooner if it had been one of the other sides. :)
Rolled a 19? Oh.. well actually I meant that the RED one was the tens. Now it's a 91! :)