Baseball? No. Football? No. Soccer? No. Bashing each other's brains out on the internet? No.
It's rhinotillexomania or - yup - picking one's nose.
Over 91% of Americans admit to doing it - the majority with enthusiasm - and some - with relish.
All the details are in a study done a few years back by the Journal of Psychiatry.
Pick and choose your own highlights:
http://www.uselessinformation.org/nose/index.html