https://en.wikipedia.org/wiki/Buffalo_buffalo_Buffalo_buffalo_buffalo_buffalo_Buffalo_buffalo

see also https://en.wikipedia.org/wiki/James_while_John_had_had_had_had_had_had_had_had_had_had_had_a_better_effect_on_the_teacher

Gorilla gorilla, Gorilla gorilla gorilla, gorilla Gorilla gorilla

Ignoring capitalisation you can add as many buffalos as you like and still be parsable. I’ve only ever heard buffalo used as a verb in this one context, though, so seems a bit forced to me