MS Teams: Announcing that Firefox isn’t supported and you need to use Chrome or Edge, but if you hit ‘back’ at the right time everything works fine.

Sketchy online stores: “Sale ends in <time counting down>” but the time is just a random duration generated in JavaScript.

Autodesk: “Auto-renew Fusion 360 or you’ll lose your SPECIAL PRICING!” The ‘special pricing’ is full price. Their web store has a 25%-off sale on.