The photo above is of "bottleneck gourds" and was provided by Laurie as one of a series of inspirational photographs to help us write a bottleneck poem. They look like butternut squashes whose growth was impeded by wide, tight rubber bands, don't they? Poor things.
However, the Wikimedia photo below inspired me to write a haiku based, I must admit, on ancient personal experience.
much fun with bottles
often leads to too much fun
starting with necking