Skittles, like M & M's, must be eaten in sets of 2, in the same colors. So I must eat 2 blues, 2 reds, 2 greens, etc etc....in the instance of uneven numbers I match them by color if they M & M's and by flavor if they are Skittles. So if I have a red, a yellow, a blue and a brown M & M left I can pair the red and yellow and blue and brown, or I can pair the red and blue and yellow and brown......with Skittles if I have a red, a yellow, an orange and a green I will pair the red and green and the yellow and orange.....if I still have an uneven number I will eat the last 3 at the same time. Yes, I am definitely very OCD about my Skittles/M & M's...LOL