If we were allowed to use coarse language, inappropriate jokes and nonsensical or absurd comedy in class, this South Park episode would be ideal to give an example of the trickery of pronunciation and collision of words.

It goes like this:
do you like /fɪʃtɪks/?
do you like putting /fɪʃtɪks/ in your mouth?
what are you, a gay fish?
The trick is all in that /t/ that ends up sounding a bit soft due to the rushed way in which we name and identify this particular product.
The above could serve as a jocular introduction to a couple of pronunciation games emphasizing how we really say words in English, and how these words are never in isolation but actually mashed together head to tail... something like the teacher reading out different pronunciations of different phrases, as the students match them to transcript; or teacher giving red and white squares of paper to be placed according to the stress in a phrase or sentence.
(of course, as wikipedia tell us, fish sticks are really fish fingers, as they were called when they were first invented in Britain. To which could follow a discussion on how some jokes can only be validated locally).