Loaning money to your brother-in-law.
Not paying off your debt to a loan shark.
Sending money to some guy in Nigeria.
Not having a prenup with your first wife.
Not paying your taxes.
Betting your nest egg on a hot tip at the racetrack.
Taking all your money out of Apple and investing in Eastern Airlines stock.
Throwing away the winning lottery ticket before checking the numbers.
Starting as an Uber driver with a rickshaw.
Stealing the identity of a person on the FBI ten most wanted list.
I’m sure there are many more regrets, but time and space doesn’t permit me to list them all.