Not my idea either but I'm afraid I don't know where it comes from so apologies if you've all heard it before.
Think of a meaningful sentence which contains the word "and", five times, consecutively (no other words in between), as in "and and and and and" *.
You can add punctuation but no full stops; this is just one sentence.
It can be done!
Here's the answer (have a good go at it before looking, it really can be done). Feel free to come up with a better answer if you can
* You might say that the question answers itself. Not a very good answer though.