'I' before 'E' except after 'C'. But not 'their'. Any other exceptions to this rule?

In primary school we were taught the rule, ‘I’ before ‘E’ except after ‘C’. But then one smartarse kid in the class pointed out ‘their’. I’ve soon realised that there must be more than just one of these exceptions to the ‘I’ before ‘E’ except after ‘C’ rule. So far, I’ve come up with heir (an easy one), atheist, policies and that’s it so far. Are there any other exceptions to this rule?