Actually that reminds me, that glass contains a groovy ice cube. Its an idea I got from my Mum who got it from goodness knows where. The idea is you get a skinny wedge of lemon, orange, lime or whatever fruit you like, some mint or lemon balm or similar and put all that into the base of a muffin tin then you put in about 1cm of water and freeze it. You end up with a dozen or so of these...
Which are great as they are bigger than a normal ice cube and last a bit longer (not much longer today though). Keeps your water or juice or whatever fresher.