Lisa Kudrow dropped by Watch What Happens Live on Wednesday and naturally, the conversation turned to her hit show Friends [1]. When asked by a caller if she could recall the worst behavior by a guest star on the series [2], she had a pretty disturbing answer: "I rehearsed without makeup most of the week and then on show night I'm in hair and makeup and I was told, 'Oh wow, now you're' — can I say it? 'Now you're f*ckable," Lisa explained, adding, "That's bad behavior, I say." Fellow guest Jennifer Beals asked if Lisa retaliated, to which she responded, "I told Matt LeBlanc. He's like a big brother."

During the aftershow, Andy tried to get Lisa to name names, but all she would reveal is that the rude star was not Charlie Sheen [3]. Phew. Friends was on for 10 years and welcomed nearly 50 male guest stars [4], so the list of culprits is pretty extensive — but that won't stop us from trying to figure out who this jackass is. Thoughts?