No, this was not said by Yogi Berra

[gridlore]

When you play with fire, there is a 50/50 chance something will go wrong, and nine times out of ten it does.

Comments

[stevegreen.livejournal.com]

I'm 110% sure you're right.

[notthebuddha.livejournal.com]

It sounds like a bit of a Pratchett paraphrase.