Yeah, I had it happen in a ring game. However, I didn't have any cards. LOL, I was multitabling and looked and didn't have any cards, I was like WTF. But I had the call, fold and raise button. So I called.
the flop came 8AJ, the BB bets out half pot, so I called. The turn was a 4. The BB bets pot, I'm like I have no clue what I have, but I want to see how this goes, so I'm calling no mater what. I call, the river comes a 4 and the BB bets out pot. I called and then my cards showed up, I had 84 LOL, and the guy in the BB had AJ and he was like how do you call that on the flop and I told him I couldn't see my cards. I wanted to see how it panned out. And I told him don't you think I would have reraised you on the river had I known I had a FH!!!
So it is possible, I'm sure if you hover your mouse over your name it will tell you what the cards are. I just wasn't smart enough to think about that as it happened.