What is this wordplay I'm thinking of involving homonyms?
I remember knowing there was a name for this type of sentence construction, but I can't recall it and google is failing me.
The basic concept is that you use a word in two different meanings in the same sentence. A (poor) example is: "He ran a marathon and his own company", playing on the idea of running as a physical activity versus running a company. What is that called?
Zeugma Is the word you're looking for:
a figure of speech in which a word applies to two others in different senses (e.g. John and his driving licence expired last week).
Also know as syllepsis.