Interventrifuge

This could apply to couples or to other situations such as international negotiations.

It is decided by certain persons that two disputing individuals, often in sexual relationships but other possibilities exist such as bosses and employees, presidents of nations etc, need to resolve their conflict. In order to achieve this, they are lured into a room. It looks like an ordinary room at first, with furniture, carpets, doors and windows. However, as soon as they enter, the door slams and locks, then the inner door disengages from the outer one and the room begins to rotate slowly about a horizontal axis, gradually accelerating. Tables, books, cushions, lamps, shelf ornaments begin to tumble about the room. On opposite sides of the room there is a pair of concealed handles which must be unlocked and turned ninety degrees at the same moment, using keys which are similarly concealed somewhere in the room. This can only be done if the two parties coordinate. If they fail to do so, the rotation continues to accelerate until they are seriously bonked with room contents and the gee forces cause them to pass out.

This forces both individuals into a shared threat situation which bonds them together emotionally and forces them to work together to avoid injury and unconsciousness. There may also be a fair bit of throwing up, nausea and dizziness. This could possibly result in greater world and marital harmony.

A note on the category: the entrance is a door and it revolves, kind of.