Liberal MP Justin Trudeau was heard swearing at Environment Minister Peter Kent during Question Period Wednesday. The expletive can be heard here, at the end of this exchange between NDP MP environment critic Meagan Leslie and Peter Kent:

After QP, Liberal MP Justin Trudeau rose on a Point of Order. Trudeau apologized for swearing, and retracted his comments. What ensued was a demand for more retractions, apologies made, even a little dishing of holiday cheer. Listen to Justin Trudeau, Peter Kent, Andrew Scheer, Ryan Cleary, Wayne Easter, Peter Van Loan, Cleary again, and John Baird: