Jeremy Piven -- now famous for bailing on Broadway -- made it a spectator sport last night ... and ran smack into one of the co-stars who was also a victim of too much mercury.
Piven was mum as he left Will Ferrell's show -- ditto for former "Speed-the-Plow" co-star (and "Mad Men" cast member) Elisabeth Moss.
Piven Back on Broadway
2/27/2009 10:06 AM PST BY TMZ STAFF
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