These are most fascinating. They would go nicely with the inverted beer glass I posted ages ago but can’t be bothered looking up to link. You can buy them here.
He’d do it out of these glasses.
I post a lot of rubbish inventions and gadgets here that you could probably find for yourself at Granny Mays, or any other novelty gift shop.
These glasses are something I’d actually buy. If I was still a single uni student.