Poo Go
Poo Go is an untraditional way of playing Go. In my family we use the german term "Klo-Go", which could be translated go "Toilet Go". Basically, you play Go while sitting on the toilet.
I am playing this with my father very often. We have a piece of squared paper fixed on the wall in front of the toilet bowl and a pencil lying on the windowsill. It's kind of pen & paper Go, with a square and filled/empty circles, usually 13x13, it would last too long otherwise: Whenever one of us is on the toilet - and it's his turn - he is making a move.
Such games get very interesting, as you can think about your move for half of the day.
Additional tip:
- After the fuseki, we use arrows made out of post-its to mark the last move, so we don't have to search for the new stone.
If you like, try it and comment on your experience! -- Cerebro?
My tip: don't use the post-its. It is irrelevant where the last stone was placed. You're confronted with a certain position and want to play the best stone (in your opinion). Most amateur players (including me) play an answer to the last stone played too often. Treating each move as a whole board problem can make you play much stronger, given you've enough time (which isn't a problem playing Poo Go if I undertsnad correctly).