Worked with some teachers in a school. Occasionally we’d forget something dumb at our desk like our attendance notebook or a stack of handouts for the students. In most cases there was usually someone from our group sitting around at our office space, doing a bit of prep work. We all used iPads in our lessons, so one day I used a combination of Siri Shortcuts with IFTTT, a smart plug and a cheap little lamp to create a quick little alert system that would inform a peer at the desk if something was left behind. The light would click on, and when someone noticed, they’d check the group chat to see who sent it and what was needed.