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"Placebo Day" is the unofficial holiday for fans of the rock band Placebo, held annually on 2 May. Its origin lies in a lyric from the band's song "The Bitter End": "We're running out of alibis/On the second of May."

The original group to have started this holiday seems to be the LiveJournal Placebo fan group "placebowhores" ( although it may have originated elsewhere.
"I'm going to listen to 'Nancy Boy' all day long this Placebo Day!"
by prettygolucky May 03, 2006
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