I always find myself laughing at the criminal in each episode because little do they know just what they are getting themselves into. If the killer knew that just hours after the crime has been committed a seemingly dim witted police officer would badger them with questions night and day until he finally catches him or her, they NEVER would have committed the crime :P
Columbo is a truley loveable police lieutenant who will walk into a murder scene with his broken down car, smelly cigar, worn trench coat and almost automatically know who the killer is. He starts by finding tiny details in a crime that (quote) "bother him," (unquote).
I will NEVER forget the episode where someone asks, "Lieutenant Columbo, do you u have a first name?"
He only smiles and answers politely, "yes: its Lieutenant"