Suzie Plakson

Ted and Robin are surprised to run into Barney when they volunteer at a homeless shelter on Thanksgiving.

When the gang views a tape from Barney's ex-girlfriend, everyone must share their most embarrassing moment in order to get him to tell the full story about the tape.

Robin becomes increasingly suspicious of Barney's relationship with Patrice. Meanwhile Marshall discovers his mother is moving on in her romantic life… with a very disturbing partner.

When Barney prepares a comprehensive pre-nup, the other guys decide to propose relationship amendments to their significant others; Quinn is furious and makes a pre-nup of her own.

Marshall, Lily, Robin and Kevin celebrate Valentine's Day with a weekend in Vermont; Barney meets his match.

When Zoey's naive cousin (Katy Perry) visits, Barney makes a move on her; Ted comes to grips with his feelings for Zoey.