I've always had a thing for gag boxes. I recall my dad having an enviable collection of adult novelty boxes that he would carefully keep hidden from the Yuma youth brigade (we knew exactly where they were hidden and took great care, after ogling, to replace them in the exact same corner of the upper closet shelf.)
Collectors Weekly interviews Mardi & Stan Timm about their collection of gag box novelties, many produced by the H. Fishlove and Co. and the brains of the operation - Irving Fishlove.
Here's a few from their collection:
For the novelty connoisseur, The Timm's website, timmstuff is worth a peek.