Mostly Halloween stuff. Every year was different. A good year at a friends house, I installed single strobes in large boxes lined with aluminum to give maximum reflection throw and put several up on the roof, aiming out to the back and wired it all to a random flash power supply. It was powered via remote which I had in my hand. I would fire it up long enough to simulate lighting flashes and I was even impressed, as it actually looked like lighting outside. People kept going outside and were dumfounded when they saw no clouds at all! Kept at it until they all quit drinking. :bonk:
Another year, rigged hidden strobes in bushes next to a beeper that caused people to investigate in the dark yet get blinded when it was turned on (on older kids only), then I chased them down inside a Freddy outfit. They were running blind, freaking out!
Most recent, I did a prop for my daughter's church play, Willie Wonka and the Chocolate Factory. The prop was the thing that shrunk the kid. Had 8 Vista strobe heads on that thing.