Can you think of any brain teasers? these are often useful in school because they can engage a teenager's attention before they even realise what's happening.
Here's mine:
Which is the only word (i think) in the English language to contain only 1 vowel, but that 1 vowel is in the word 5 times?
why dontcha just play countdown with them occasionally in class? We used to do it sometimes at my high school. I'm sh1t at the conundrums, i find that I either see it immediately or I dont see it EVER!
p
theres a brainteasers thread I think they're mostly maths based tho.