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Your Mileage May Vary

/Y-M-M-V/

[from the standard disclaimer attached to EPA mileage ratings by American car manufacturers]

cav. 1. A ritual warning often found in UNIX freeware distributions. Translates roughly as "Hey, I tried to write this portably, but who *knows* what'll happen on your system?"

2. A qualifier more generally attached to advice.

"I find that sending flowers works well, but your mileage may vary."