Simple Rick Roll qr code disguised as a WiFi qr code. Effectiveness is highly based on how tech savvy the victim is, and whether or not they are given a preview of the link. Designed to be 2-tone, so the bottom rectangle is 1 color, and the actual QR code and text are another.

Superslicer (and likely Prusaslicer) should give you the option to automatically apply a color change partway through, if you do not have a multi-filament/color extruder.