First, I'd have been able to run it (or grade it even without running it). And yes. I've seen a lot of crappy Haskell code. I've written a good amount of that myself when I was learning Haskell back then.

Second, assuming I didn't know Haskell, I'd have stopped your babbling in the presentation at some point and asked you to run it.

Third, any student that does unusual things is either very good or very cheeky, so those students deserve special attention. So 10 minutes at your and my convenience to run the demo in my office would always have been an option.

(But then, teaching at my university probably was quite different from teaching at your university).