I like this suggestion - you get an opportunity to contrast / compare different constructs in each language that can provide similar functionality, and pick out special features that make it awesome. It's a bit like a code golf challenge, do the same thing in the most: elegant / performant / insane ways.
I assume folks have met the 99 bottles website (1500 languages)?:
I provided one of the GNU Make implementations, which lasted about a week before it was improved upon :)
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