[Unai]

If you don't have a dice, you can mentally roll one. Think of a bunch of numbers and add them all together, then add every digit of that number, and so on until you end up with a single digit from 1 to 9. 1, 2 and 3 is rock, 4, 5 and 6 is paper and 7, 8 and 9 is scissors.

For example: 23+42 (or 2+3+4+2 if that's easier for you to do, the result will be the same) = 65 → 6+5 = 11 → 1+1 = 2, rock.

Great to fall asleep, given how boring the game must be. I use that dice system in bed but in a RPG game (1 = "No, and also..."; 2,3,4 = "No"; 5 = "Yes, but..."; 6,7,8 = "Yes"; 9 = "Yes, and also...").