Annoying sound maker!
The Annoy-a-tron - An Annoying Beep Prank from Gadget Shack on Tindie
Annoyatron
Building Your Own Annoy-a-tron With An ATtiny85 Pedro Liska, 55% OFF
Cat led blinking badge / ornament from Suicidebattery on Tindie
Lenin Electronic Badge v2.0 from GizmoLab on Tindie
Newbie here: how can I make my own annoy-a-tron with custom sounds
New Arrive Funny Hidden Annoying Beeper Office Prank Devices
Twinkie's 2019 Holiday Ornament from TwinkleTwinkie on Tindie
Dr. Who inspired T.A.R.D.I.S. badge with flashing led.
Dr. Who inspired LED badge
How can I make a random chirping device as a prank gift? : r