I believe they missed the following one: I can't remember it exactly, but in the tea-time scene, the guy gives Alice a quiz regarding the topology of a chair o

I believe they missed the following one: I can't remember it exactly, but in the tea-time scene, the guy gives Alice a quiz regarding the topology of a chair or something... She tries to solve it, upon which they burst out laughing at her saying "there is no solution!" Does anyone else remember it or am I trippin'?