"MILLER!!" (Butle Boy)
"I have some roses. White roses." (Speaking of retirment)
"I suppose you could call 'that' a uniform" (a stretch for the Colonel to compliment Columbo's police attire)
"I know you do" (answering Columbo's comment that Columbo needs his help.
In Identity Crisis "I must have mis-laid a day somewhere" was always a favorite of mine.