Seconding the "less/fewer" and "lose/loose" confusion hate.
In fact grammar and spelling pedantry is a sub-section on its own. People who write "discrete" when they mean "discreet" is another bugbear.
Thinking I've spotted a parking space then realising there is a motorbike/tiny low-slung sports car already parked.
Losing my temper with an animate object and invariably coming off worse, usually ending up with a bruise or cut.
Throwing something in the waste bin and watching it bounce off the rim and land just out of easy reach so I have to contort myself to pick it up again.
Waiting behind someone at a petrol pump who, after paying and returning to their car, proceeds to put their seatbelt on, reset their trip meter, put various items in the glovebox, check their phone, cook a three-course meal...JUST FUCKING MOVE!!!