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Barney teaches Marshall how to pick up women. When things start to go sour for an awkward Marshall, Barney steps in and wins the women over... for himself. Meanwhile, Lily is back from her art experience. While helping her look for a new apartment, Robin gets sick of hearing about Lily's amazing summer in San Francisco.
Ted: She's miserable. She's realized that she's made a huge mistake. Her and Marshall will be back in a week. I love it!
Robin: Um, no. You just want Lily to be miserable. The truth is she's happy.
Ted: Trust me. I've known Lily for 9 years.
Robin: Trust me! I'm a girl!
Ted: Yeah, but you're Canadian.
Lily: (to Barney in a bar, to help Marshall by ruining Barney's night with twins) You jerk! You gave my twin sister chlamydia!