Conan O'Brien pops in at "How I Met Your Mother" (Reuters)

[unable to retrieve full-text content]Reuters - Yes, that really was Conan O'Brien standing by the door in MacLaren's bar on Monday night's "How I Met Your Mother."

Source: http://us.rd.yahoo.com/dailynews/rss/celebrity/*http%3A//news.yahoo.com/s/nm/20120221/tv_nm/us_conanobrien

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