https://projects.raspberrypi.org/en/projects/fart-detector
"All kids understand that farts are funny. As we grow older, some of us lose our sense of humour in this area. You’ll be glad to hear that we believe that building a real working fart detector has both educational and comedic value."
https://projects.raspberrypi.org/en/projects/build-your-own-weather-station
If you have some of the measuring implements for the Raspberry Pi Weather Station but not the HAT (which was only distributed to schools), then this page will show you how to actually use the damn things.

https://www.instructables.com/id/PiAnyWhere-4G-LTE-Hat-for-the-Raspberry-Pi

Makes cool projects, including Linger, for dicking with public WiFi surveillance.

https://learn.adafruit.com/raspberry-pi-physical-dashboard?view=all
Making a funky 1970s-sci-fi-style readout with a Pi and some 7SDs/motors.

https://www.hackster.io/jacquin-buchanan/intellisaurus-dinosaur-robot-kit-662245