One of my old creative directors use to use the word "agreeance" all the time and it would set my teeth on edge. Technically, it's a "real" word but up to that point, I'd never heard anybody use it. "Agreement" is more to my liking.

"Irregardless" is another malaprop that is also a "real" word now, probably because so many people use it!!

Funny story, Tina!