Conan O'Brien, Lance Armstrong Conan O'Brien, Lance Armstrong

Conan O'Brien and Lance Armstrong engaged in the perhaps the mildest of all Twitter feuds.

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"Yesterday was the longest day of the year, unless you count the time I interviewed Lance Armstrong," the former Tonight Show host tweeted yesterday.

The cycling legend was quick with a reply: "@ConanOBrien all you wanted to talk about was riding bikes and shaving your legs. It was, uh, slightly freaky."

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The funnyman continued the back-and-forth: "@lancearmstrong - I was drunk. And I wanted some tips for smoother legs. Is that so wrong?"

What do you think of their ultra-gentle Twitter war?