Sometimes in a pitch game,the dealer pushs the top card up a bit. As they are dealing to the right side of the table,they turn their body in such a way that the first base can see the card.If no-one takes a hit,and the dealer has a made hand,you now know what your first card is going to be.
Doesn't happen often,but its a huge advantage when it does.
I suppose a sophisticated team could really exploit it with 1B signaling the card to the other side but I've never played as a team.