I need to play short video clips (with sound) as a fullscreen overlay in Windows; this needs some kind of playback trigger - hotkey or midi.
Explanation: I'm doing classes in University, a screencap from my PC goes to projector, all students watch the projection and try to follow, usual stuff. The class can get a bit boring and from time to time I wanted to play something to wake people up (probably screaming goats, but suggestions are welcome). So the idea is to have few videos mapped to midi or numpad and trigger them at any point.
(This can be done with hardware video mixer, or using virtual camera and vj software, but that's not my question.)