When I was at school, in assembly we sat in rows on the floor. We would start picking at the cardigan or jumper of the person in front. We would pick off the bits of bobbly wool. The aim was to collect the biggest ball of fluff.
I cannot remember what we did with it but it carried on for months.
I don't suppose mothers were impressed with bald looking cardi's.
When In class the window was facing the main Ddeinol Road, every time I hear a HGV coming I used to tell the engine by the sound ( Sad Person eh) I ended up driving the dammed things.