telling, with reasons
You may be approached by a peer who informs you they're telling on you. If this news is imparted with a musical lilt, the game is afoot. You are obliged to ask why. The other party will respond with a reason, which must rhyme. Reasons I can recall include: * Because you jumped on a lorry and you didn't say sorry * Because you walked in the garden and you didn't say 'pardon' * Because you went to the toilet, and you pulled the chain, and out came a great big chuffer train Particularly ingenious rhymes will spread throughout the playground rapidly, but no-one will ever believe that you made it up.
written by Ni*k *immoc*, approved by Log

Although practiced every day at my primary school, the rhymes were limited to the everyday "...'cos you licked my lolly and you didn't say sorry" and the lunatic "...'cos you jumped in the pond and kissed James Bond". As if Bond would be seen dead in our crappy pond.
written by He*th*n Ch*nee, approved by Log

Our version went "Because you kissed a kangaroo in the middle of the zoo at half past two." References to poo and a loo were not uncommon.
written by Ni*k *, approved by Phil

See also: I'm telling
you're smelling
your bum is like a melon.

written by Mi*hael *ordy*e, approved by Susan

I'm telling,
You're smelling,
You went to a black man's wedding.

I would imagine that Eddie doesn't get invited to many black mens' weddings. More fool him. I HAVE been to a black man's wedding, and can report that, far from the cake being made of rice and peas, and the ceremony being conducted by a man with skellington make-up like in 'Live and Let Die', black mens' weddings are perfectly charming.

written by Ed*ie R*nan, approved by Mansh

I once overheard another kid at playtime say "I'm telling miss that you said F-U-K" and for years after, I though 'fuck' was spelled 'F-U-K'. Embarrassingly, it was my nan who finally corrected me when I dutifully pointed out some misspelled graffiti in the park. Fuking know-it-all.
written by Ne*l Vom*t, approved by Ponky

Our version went thus:
I'm telling on you
You dirty kangaroo
You pushed me in the river
At half past two.
Interestingly, there was a river fairly near to our school, although to the best of my knowledge, no-one was ever pushed in it by a kangaroo, dirty or otherwise.
Someone once punched the headmaster in the FACE, though. IN THE FACE!
written by Ca*tain *rack*rj*ck, approved by Mansh