If you want to drop something without placing it, perhaps to give something to another player, you can press the Q key while holding it.

F3 + Q - Displays help menu that lists all debug menu shortcuts. F3 + A - Reloads all chunks. F3 + T - Reloads all textures, sounds and web-loaded client resources. This is useful for texture pack creators.

Some historians believe that mancala is the oldest game in the world based on the archaeological evidence found in Jordan that dates around 6000 BCE. The game might have been played by ancient Nabataeans and could have been an ancient version of the modern mancala game.