During A FRIEND IN DEED when Columbo shows up in Deputy Commissioner Halperin's car and he's looking for the cigar under the seat. Love this scence. "Come here you little rascal." (Also, check out the reactions on the faces of the cop in the front seat)
In "Double Shock" when Mrs. Peck blasts Columbo when he drops the ashes, and then tries to wipe it out, in the gym area where Clifford Paris was found dead. Also in "Negative Reaction" when Columbo goes to see Mr. Glescko and while he is waiting he puts the ashes in his coat pocket.