sort Magento collection AFTER load

Question

The Magento collection sorting functions (e.g. Mage_Eav_Model_Entity_Collection_Abstract::addAttributeToSort) work by adding an ORDER BY clause to

Answer 1

Here's a tip; A collection's clear method unsets it's loaded flag, it allows you to change the sort or filters and run the new query.

I accidentally discovered it when answering load only configurable products.