I've seen two different guests mis-say a word. I can't think of the specific example, but each person audibly said a word that didn't fit in the sentence but could look similar to the correct word when in print, paused briefly, then corrected himself.

That's the only proof I have, but it's pretty convincing to me.

How often have you been talking to someone:

"What did you think about the show?"
"The last time we were then, it wasn't... we were there, it wasn't that impressive."

What is it they say about silence being golden?