[praptak]

The internet reports that D100 is impractical to use but it's cool if your game design calls for a relatively rare "ritual value".

[eutropia]

We had such a ritual in our games back when I was in high school: the start of the campaign luck roll.

The idea was that your starting circumstances would be modified by the d100 zocchihedron roll.

One time, my buddy rolled a 2; our DM grimaced. "Well, you aren't starting off dead... but you might wish you were".

His starting conditions?

Naked. In total darkness. Sealed in a coffin. But at least he wasn't alone: he had a rat nibbling on his toes!

[sgbeal]

> The internet reports that D100 is impractical to use...

It's a nice novelty but it's not terribly practical. Despite having a d100, 2d10s are invariably more comfortable to use and easier to read. My d100 was purchased back in 1998-ish for its novelty and nostalgia value, not its functional value.