Using 2 hours of precious time to save $2.
Investments with a time frame that is longer than their expected remaining life.
Driving across town to get a couple of percent off a tank of gas - actually wasting petrol and time.
Hoarding stuff that they will never use - often stuff that would be useful to their kids or friends.
Then again I see the opposite in some people: drawing down a reverse mortgage like they'll be dead in 5 years and ruining their finances. Smoking and boozing and otherwise ruining their health because they "haven't got long to live".