saying 'a red and a yellow and a purple and a blue,' really fast to music, is fun when your stoned, although it gets kinda irritating...
i also enjoy;

commiting various felonies,
talking to myself in the garden,
sleeping, eating, tv, sex -etc.
baking cakes,
BINGO! haha, or line dancin, (its cool cuz u get really kaned and go dance with old ppl and win money...)
write sketchy books,
read sketchy books,
play catch with knives,
and by far the best, riding quads and motorbikes fucked off your trolley on mushrooms haha, (i guess that one only counts if your on shrooms tho lol)