Feature-length film comedy is harder to pull off than the episodic sitcom - it doesn't have the same factory machinery up and running teams of writers putting familiar characters through permutations - but that doesn't explain the widening quality gap that makes movie humor look like a genetic defective.
To know how to suggest is the great art of teaching. To attain it we must be able to guess what will interest we must learn to read the childish soul as we might a piece of music. Then by simply changing the key we keep up the attraction and vary the song.