Remove the bottom of the can completely. Cut almost all the way around the top, leaving a small piece attached to act as a "hinge".
Start with a "Why is my Wi-Fi slow?" scenario and reveal the surprising things that interfere, like microwaves or even a fridge. Wifi School project.mp4
Place a device (like a phone) a set distance from the router and record the baseline signal strength. Remove the bottom of the can completely