I found that a good way to get cool electrical sounds is with any commercial bug zapper.
The sound of a burning fuse of some firework.
The classic thumps as someone knocks on a door.
Entering a code and opening/closing a security door. Recorded on-site at an apartment in Seoul, Korea. Recorded on a Zoom ...
Recording of a rollercoaster's braking system stopping a train
Me crumpling a wrapper. Recorded using an Electro-Voice RE20 microphone. Some background noise from studio next door.
Quickly opening a candy bar wrapper. Made sure to make the wrapper sound extra crinkly.
Water spilling onto paper and then being wiped by hand.
Trash truck outside my office window backing up.
Close mic recording of multiple coins dropping onto a desk or a hard surface. Recorded with Shure SM57.
Several takes of a coin dropped on other coins. Useful for games when picking up money, for example. You'll have ...
Mono recording of antique cash register sounds made with Sennheiser MKH 40.
A mono till or cash register with a bell. Made with parts of a recording of a vintage typewriter (mostly ...