Hillary Busis
May 05, 2011 AT 03:34 PM EDT

Peter Kramer/NBC

Last night, Stephen Colbert let us in on a little secret: Everyone who works at Viacom — the company behind networks including Comedy Central and CBS — has to share a single bathroom, which is located on the set of The Colbert Report. (The arrangement’s particularly tough on Craig Ferguson, Stephen told us — “He has to fly in from L.A.”) They also share a single bathroom key. Naturally, when someone wants to pay a visit to the porcelain throne, things can get a little complicated. Watch the clip below to see Stephen make a surprise appearance on the set of The Late Show, then get caught unaware by a certain newswoman once he finally makes it past the bathroom door.

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