Well, they've selected the three finalists for the caption:
"Can you please pass the cow?"
"Let me start by welcoming you all to Narcoleptics Anonymous."
"By a 9-0 vote, the rest-room expansion project is approved."
None of them is brilliant (they rarely are). I guess I'd say the best option is the cow one.
What's really odd is the idea of a giant cup of coffee was explored in yet another cartoon earlier this year. But it wasn't in the artwork, just in the caption.
The winning caption for this cartoon (from June 30) was, "Let's continue this discussion over a hot barrel of coffee."
So apparently giant-coffee-cup humor is HUGE right now!