What production code is listed for the episode Slap Bet?

The production code listed for “Slap Bet” is 2ALH09.

“Slap Bet” is the ninth episode of How I Met Your Mother’s second season and originally aired on November 20, 2006. Its production code follows the show’s season-based numbering pattern: the first digit identifies season two, while the remaining code distinguishes the production entry within that season.

The episode was initially titled “Robin Sparkles,” but the title was changed to “Slap Bet” so the reveal at the end would remain a surprise. In that reveal, Robin’s hidden Canadian past is exposed: she was a teenage pop singer. The episode also establishes the slap bet between Marshall and Barney, a running storyline that returns several times across the series.

The nearby options are easy to confuse because 2ALH08 belongs to the preceding episode, “Atlantic City,” and 2ALH10 belongs to the following episode, “Single Stamina.” Production codes are not always identical to broadcast order in television, but here the code aligns with “Slap Bet” as season two’s ninth listed production.