I know gun-fu
The first recorded meetings between Japan and westerners are actually kind of sweet.
The Japanese thought there was some secret to using firearms but the Portuguese were just like "It's easy! Stand straight and close one eye! Couldn't be easier!" but the Japanese still thought it was more complicated than that and assumed the Portuguese were talking philosophy. It took some back and forth to make them understand that it wasn't a difficult discipline to shoot a rifle.
21st February 2020
Bayonets, making guns backwards compatible.