Alyson Hannigan, 'How I Met Your Mother'

Alyson HanniganNeil Patrick Harris
Hannigan's Lily disappeared for four weeks in the spring of 2009, giving Barney (Neil Patrick Harris) the cold shoulder after he told a hideously inappropriate -- but funny -– joke. Lily's pretty hard-core, not to mention thoroughly used to Barney, so her full-on boycott of the bar didn't... CBS
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