Tipp Ex
Legendary corrective fluid with multiple uses beyond splodgily painting over fountain pen errors and, of course, sniffing it. Two favourites:
1) Painting boiled sweets with it to create delightful 'mints', and handing them to younger pupils.
2)Upon hearing the shouted request of "lend me your Tipp Ex", painting the outside of the bottle and obligingly throwing it by the cap to assist your hardworking chum.
written by Ea*er Da* J*r, approved by Conor

Tipp Ex was banned in our school after a girl painted her face with it and sustained chemical burns. Her younger sister always referred to her as 'the victim', presumably believing that her sibling was somehow attacked by the Tipp Ex.
written by Ma*k Row*ll, approved by Conor

Tipp Ex seemed to be widely prohibited; it was banned at my school too.

The reason we were was given was that it "looked messy" on pupil's work.

So apparently, slightly shiny and bobbly bits of paper are more "messy" then bits of paper covered in pictures of thick spunking cocks and women with their legs open. Right.
written by Ma*k *., approved by Matt

Kevin Holcombe painted his 12-inch ruler with a fresh coat of Tipp Ex during every lesson for a whole school year, eventually achieving what can only be described as a diamond-hard block of solid Tipp Ex, and the most sought-after weapon in ages.
written by an*nym*us *ser, approved by Conor