How I Met Your Mother Season 3 Episode 13: "Ten Sessions"
Ted is still seeing his dermatologist Stella (Sarah Chalke) to have his butterfly tattoo removed. Ted asks her on a date but she says no due to it being unethical. Ted has ten sessions to convince her to change her mind.
Stella: Ah the butterfly tramp stamp, my bread and butter. So I'm guessing that the real stories involves a bad break up and some booze, unless it's a gang tattoo in which case I thinks time to, find a new gang. Ted: Ah no, I just thought it would be cool to get a caterpillar tattoo, then a few weeks went by and all of the sudden