[tbeatty]

I took spanish in H.S. and luckily didn't need it for college. "en" meant on and in. No rules. I don't know how you explain why you get on the bus and in the car. It's all be sound. Or why the following makes sense: "I turned the alarm off after it went off."

[Husker24]

It seems like if you get on something its usually something large, like a bus, but when you get in something its usually something small, like a car.

[185JHP]

There was a guy on ESPN who kept saying "El Fuego!" when a particular player was on a hitting tear - later he said he meant to say "En Fuego!" Hard to tell, with those guys...