I guess if we discussed it enough, we wouldn't even exist.
Depends on what you mean by "exist"...

If I had posted my first count, I would have gotten it wrong. But I recognized the text was one of those illustrations of perceptual pitfalls, so I went letter by letter, using a pencil as a pointer on my monitor, and came up with the correct count. By that time, others had posted the correct count, so I didn't bother.
Then Modulous posted his inspired reply. The point is that the quote marks are supposed to surround an exact replica of what we look for; by that criterion, there were none (no "F's") in the passage.
So it amused me that Modulous had taken an exercise that demonstrates we don't always accurately process what we see and used it to demonstrate that we don't always say what we mean. So the exercise did double duty.
I didn't mean to be contentious, merely to salute Mod's sharp eye.