Anonymous functions in Python are what immediately popped into my mind. I do embedded work and mostly use C, but a lot of the problems with C actually make since when you have less than 1 kB of RAM. I'd prefer to use Lua for building test applications and the like, but I keep going back to Python because the library support is tremendous in comparison.

In any event, I think the question of what problems you have with your favorite language is at least a good conversation starter. It would be nice to know that those kinds of conversations are easy and interesting to a candidate. Although, that isn't necessarily a requirement.