Strip Malicious Mischief

Ah, the games people play:

A 23-year-old Tacoma man and an 18-year-old Lakewood woman are suspected of throwing rocks from a railroad trestle onto at least 14 vehicles traveling southbound on Interstate 5 early Monday.
Investigators told KOMO-TV that the couple was playing a stripping game that involved each of them shedding a layer of clothing for every headlight they managed to break.

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I'm going out on a limb here and guess that alcohol was involved.