Good task: sequencing a text

Cutting up a text and having students put it in order is an excellent technique to help students recognise certain discourse markers.  For example, the phrase "once upon a time" always goes at the beginning of a fairy tale, while a phrase like "to sum up" will most likely go at the end of a speech.

What if the students put the text in a different order from the original? 
First decide with them if their version makes sense. 
If not, discuss why not. 
If it does make sense, then what is it about the text that would allow the sequence to be subverted?  That can often lead into some very interesting discussions about grammar.  For example, an autobiographical text written mostly in the present perfect can be sequenced in many ways...because the present perfect is used for an unspecified time in the past!