Alt+Enter Glitch/en

The Alt+Enter Glitch is a glitch where using the "fullscreen toggle" keybind would flip the player or interrupt a  command during a cutscene. While the glitch is named "Alt+Enter", any key combination that toggles fullscreen, including Alt+F and F11 (in 2.3) will produce the same effect.

Conditions
In order for the glitch to take effect, (1) the key combination or keypress must occur during a delay in a script that is more than 1 frame, and (2) the player must have control during the cutscene ( must be set to true).

If the keybind is pressed while not in a cutscene, it will not flip the player, but it will stop the player from moving left or right if those keys were held down while the toggle keybind was pressed.

Condition 1 rules out any delay of a cutscene that arises due to using  or   during a cutscene bar or fade animation. This is because those commands actually delay for 1 frame every frame if the animation isn't complete, and thus, instead of being a 15-frame delay, it consists of fifteen 1-frame delays.

Condition 2 rules out being able to do this glitch during "- Press ACTION to advance text -" prompts in a cutscene, because usually when those prompts are activated, the player's control is taken away as well. However, it is possible to obtain the prompt while still having control (Noflip). In case you do so, the player would be unable to flip, but their  could still be interrupted.