The floor is lava
The floor is lava is a game in which players pretend that the floor or ground is made of lava (or any other lethal substance, such as acid or quicksand), and thus must avoid touching the ground, as touching the ground would "kill" the player who did so. The players stay off the floor by standing on furniture or the room's architecture. The players generally may not remain still, and are required to move from one piece of furniture to the next. This is due to some people saying that the furniture is acidic, sinking , or in some other way time-limited in its use. The game can be played with a group or alone for self amusement. There may even be a goal, to which the players must race. The game may also be played outdoors in playgrounds or similar areas. Players can also set up obstacles such as padded chairs to make the game more challenging. This is a variation of an obstacle course. Typically, any individual can start the game just by shouting "The floor is lava!" Any player remaining on the floor in the next few seconds is "out" and can  not rejoin the game for some period of time. There often are tasks, items or places that can "regenerate" lost body parts or health. Depending on the players, these could be embarrassing tasks, or simple things like finding a particular person. In one version called "Hot Lava Monster", usually played on playgrounds, players must stay off the ground (sand, rubber, woodchips, etc.) and on the play equipment. The person who is playing the "monster" can be on the 'lava' with the objective of attempting to tag another player. The "monster" must try to tag or catch the other players. In  some versions, the "monster" is not allowed to touch certain obstacles, such as wooden platforms or may only touch objects of a certain colour. The "monster" must navigate across structures such as across playground slides, monkey bars, ropes courses, etc. instead of the main platform. This game is similar to the traditional children's game "Puss in the Corner", or "Puss Wants a Corner", where children occupying the corner of a room are "safe", while the Puss, the player who is "It" in the middle of the room, tries to occupy an empty corner as the other players dash from  one corner to another. This game was often played in school shelter-sheds in Victoria, with the bench-seats along the walls of the shelter-shed being used as platforms joining the corner, while players crossing the floor could be caught by the Puss. In popular culture. Film. This activity is addressed in the 2015 animated film "Inside Out", in which it is enjoyed by a girl named Riley Andersen in her childhood. The activity then becomes part of her long-term memory, creating a lake of lava inside her mind, filled with floating architecture. After being accidentally sent to  long-term memory, two of her chief emotions, Joy and Sadness, must cross the lake in search of a way to return to their control headquarters. The former enjoys reenacting the activity to find a way back, but the latter complains about the experience being too interactive. Adult entertainment industry. In some jurisdictions, dancers at strip clubs are only permitted to expose breasts and/or genitals when performing on a raised platform; they must be dressed before their feet touch the venue's main floor. Managers responsible for enforcing this rule may communicate it as 'the floor is lava'. Factual accuracy . By using the Stefan–Boltzmann law and taking convection into account, University of Leicester scientists have calculated that a high stakes version of the game would not be playable with actual lava, as the air above the lava would have a temperature too high for humans to survive for more than a few seconds.