I've already had enough of that, maybe even too much of that - but I haven't had nearly enough of this. So, it depends on whether you're talking about this or that when you say you've had enough.
Some people say enough is enough - but they really don't know what they are talking about. You don't know whether they are talking about this or that. That's enough of that but not nearly enough of this. I'll take a little bit more of this, but no more of that.
So think about this today, but not about that.