> the wine glass scenario is a _realistic_ scenario

It is unrealistic because if you go to a restaurant, you don't get served a glass like that. It is frowned upon (alcohol is a drug, after all) and impractical (wine stains are annoying) to fill a glass of wine as such.

A pelican riding a bike, on the other hand, is realistic in a scenario because of TV for children. Example from 1950's animation/comic involving a pelican [1].

[1] https://en.wikipedia.org/wiki/The_Adventures_of_Paddy_the_Pe...