For comedy drawing sessions I usually prefer draped models. I wish I could remember who drew the model above.
I don't think oddball contortions are the best use for a comedic model, but they're fine for warm-ups.
I love comedic male models who can do exaggerated conversational poses. Padded shoulders and white gloves like Daffy's has here add to the effect.
If the model requires a text to stimulate his imagination then the teacher could supply lines from a movie or a poem. Here's an altered version of a poem by Walt Whitman (below).
[Oops! I'll have to add the poem tomorrow!]
[Commentary on the poem tomorrow!]
They can make the hands bigger than life, too.
The idea isn't to copy the Olive Oyl reference slavishly but to make a funny, graphically stark and cartoony caricature of the live model.