You see what he does Paul?...do you see?....Headache comes in and out of his cave and then proceeds to leave us in the lurch.....torturing us to the bitter end!!!
I thought about Now You See Him...great answer...but where and when?...I don't know.......Headache!! the torment must end!!

The answer to #33 is:

"Well, there you are sir. You see, I'm not as dumb about these things as I thought."

Yes, it comes from "A Matter Of Honor". Columbo says it to Luis Montoya while the two of them are in the stable discussing the sort of "stick-thingy" that victim Hector Rangel would have had with him out there in the bullring.