Here's the version of BULLSHIT that I know of and played.
The game I'm talking about is best when played with up 6 people. You could play with more, but definitely not 13 people for there are 13 numbers in the deck and that would make it 99% impossible for one to actually win the game. Basically, you take out the Jokers and then shuffle the whole deck of 52 cards. Next, deal them out clockwise until you run out of cards. The person on the left begins the game by discarding one or more Ace(s) face down. When placing the card(s) face down, you must call out what you placed down. If you put down 2 Aces, you call out "Two Aces". By going clockwise, the next person would be the person on the left. That person has to follow the numerical order of the cards. That means, he or she would have to discard one or more Two(s). Again, this is done face down and is called out. Each player takes his turn clockwise. When you arrive to King, the next person starts over with Ace again. Now, where does "Bullshit!" come in? Well, this is a game of trickery, bluffing, and straight-faceness. If someone thinks that he or she is lying about the card(s) that was discarded, he or she can call out, "Bullshit!" When you look at the card(s) that were discarded and it is the same as called, then the person who called "Bullshit!" gets the penalty of collecthing the whole discard pile. If the person who called, "Bullshit!" is correct, and the cards that were called is wrong, then the person who discarded those incorrect card(s) gets the penalty of collecting the whole discard pile. Some of us may not have the next number, but we still must discard at least one card. That's where the "Bullshit!" sneakiness comes in. You need a Ten and you don't have one. You have to learn to give a straight face and discard any card, but call out "One Ten" and move on to the next person. All you can do is hope that no one sees through your lies and calls out "Bullshit!" on you. If you admit that you don't have the next number, then you have to accept the penalty of collecting the entire discarded pile. Now, how does the game end? You can play two ways. One way is to play until the first person who runs out of cards first wins... game over! The other way is to play until the first person runs out of card... then continue until the second person runs out. This could go until the first three people run out... but it's preferably when one goes out cuz once that first person goes out, it becomes extremely difficult to end the game sooner due to the mix-up of the remaining cards among the other players.
Never heard of it.
But it seems fun though.