The "check engine" light on my car came on again this morning. This has happened twice before. One time when i took it in they ran the diagnosis and said "it says there was a problem with X, but we don't see anything wrong with X, so we reset the error and we'll see if it happens again," which it never did. The other time they said "it says there's a problem with Y, and there does indeed seem to be a problem with Y, which we expect will cost about $X00 to fix."
I'm really really hoping for an X type "problem" when i take it into the shop this afternoon =P