OK, memories of this one are REALLY blurry...
a cartoon sequence - I believe it was a series of them, starts with a pan of a high-rise apartment block, and goes into a couple of kids who, as far as I can remember, were playing detectives. One of the kids is talking to a concerned "client" on the phone, and ends with "hang on tight, everything'll be all right" (saying the line so that it rhymes)
I can't remember what it is that they do or how they solve the problems though
Cherry "man this is driving me crazy" Pizza