Opening the coolant cap on a hot engine
A pressurised cooling system holds coolant well above boiling point, and cracking the cap releases it as scalding spray. It is the most common self-inflicted roadside injury there is. Switch off, wait a genuine thirty minutes, and let the attending technician judge when the system is safe to open.
Booking a city tow truck for a desert or beach recovery
A flatbed cannot drive on sand, so the booking fails at the point where tarmac ends and you pay for a wasted callout. Stuck in dunes or on wet beach sand, book desert recovery explicitly, send a pin, describe how deep the car sits, and stop spinning the wheels while you wait.
Letting the tow decide the workshop
Agreeing mid-tow to the driver's suggested garage hands your negotiating position to a stranger with your car on his deck. Decide the destination before the truck arrives, your trusted workshop, the agency under warranty, or your own parking while you compare repair quotes, and confirm the full price to that destination in writing in the app before loading.