Do you correct people?

I try to avoid correcting people. It's rare you'll find someone who appreciates it, and if you don't know the person well, it pretty much guarantees the end of a conversation. But good lord, how I've been tempted. I used to somewhat know a person who would say things like "tooken," but I knew he'd flip out if I tried to tell him it was "took/taken." "Whom" is another I hear often, but it's so common that there's no point in bothering. Plus, I confuse its usage from time to time. I guess it's not just worth it. Even if the person does appreciate it, there's a high chance they'll continue making the mistake.

Jam it back in, in the dark.