True story
And I don't know whether you'd be able to pull it off at this stage, but it might provide some inspiration. Or a laugh if nothing else.

A relative of my housemate was an English teacher. One certain English set had developed themselves a reputation of being particularly awful and impossible to control. At the start of one academic year, this woman received her teaching allocations and perused them to the dawning horror that she would be teaching this particular set for that year.

She took a deep breath and had a think.

She purchased a tin of tuna and a tin of cat food. She then removed the label from the cat food tin and stuck it around the tuna tin.

Just before her first lesson with them, she opened up the disguised tuna tin, fetched a fork and started eating from it. The class came in to find her eating 'cat food,' and for that entire year, she apparently had minimal trouble with them.
(LongJohnBaldry, Mon 11 May 2009, 20:29, 1 reply, 16 years ago)

Tuna is vile and disgusting and I will not condone it's usage in a cullonary sense.
/ac

I really realy hate tuna, and can't tell the differance between that and the cat food.
( G/PP 💩💩💩💩💩&#128, Mon 11 May 2009, 23:21, Reply)

Well, that makes it even easier for you to try
as you only have to buy one tin and don't even need to switch any labels round. Bingo!
(LongJohnBaldry, Mon 11 May 2009, 23:59, Reply)