Where something is said and then a certain person does not know a key piece of general knowledge or a word that everyone should know.
The following are examples of 'The H Effect'
The 'Person': Was Hitler British?
Everyone in the room: *stare*
The 'Person': This should be a saturday night pizza fetish
The room: What? this isn't sexual..
The 'Person': a fetish is a gathering of people, right?
The room: *stare*