Sticking to things I’ve already experienced:
Flying
Working in an office / for anyone
Going back to school
Having a mortgage
Going to a wedding
Spending any amount of money on clothes or furniture
Going out / drinking
Living with a cat again
Living without a pit bull
Getting a nerve struck while getting blood drawn
Taking a flying knee to the groin
Getting lectured by a Libertarian about the free market and inefficiency of government
Having someone tell me to turn down the volume when the loud part of Soma kicks in