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1.
-Your driving skill is inversely proportional to how attractive your passenger is.-

The non-gender-specific propensity for things to go horribly wrong whilst attempting some vehicular stunt when an attractive member of the opposite sex is involved.
John: "I've drifted that corner a hundred times with no problem, but as soon as Jane was in the car, it all went to hell and now she's left me and my car is totalled...."

Fred: "Murphy's Law of Driving dude...I told you not to try that with her in the car"
by Stig's Unlucky Cousin June 14, 2010