Tim's in-depth offering, and subsequent need for a nail brush, does show that we are not afraid to plumb the depths of lavatorial humour.
Back to Izal, as kids we used to chew it as, unlike newsprint, it didn't chew away to nothing. If we got the timing right it made excellent 'ammo' for the catapults that we made with elastic bands looped over thumb & first finger. Very accurate and by heck they could sting! Easily hidden if our teacher became aware of a 'catty' battle in the back row of his class.