A great post from the language log archives.
I'm sure I have made mistakes in spontaneous speech with these three verbs. I am not the most articulate person in the first place and the signals just get crossed in my brain. This is not some great moral failure or a sign of the collapse of civilization. It is just grammar and there is no need to get upset about it. Pullum is very good on this. In fact, I think he is the funniest writer on the internet.