I found the same thing on Datek. I've seen this happen with other stocks. I been told in the past when this has happened that someone has put a low bid (for whatever reason) but it is generally disregarded when the market opens. I think someone is just trying to give us something to lose sleep over.
I was watching the tick-by-tick chart this afternoon and saw some weird trades coming down. I saw a Bid of 22 on 100 shares, and ask of 30 on 1000 shares. This could explain what you were talking about.