This started totally by accident when i learned but maybe this funny crib helps you as well:
i was learning and couldnt tell apart ofaal and ofan. So i made my own vocab test and when it came to ofaal i thought
"Ofaal...ohfuck you should know that" and there i go...memorised the diference between ofaal and ofan by accident. Now i have problems not giggling when saying ofaal. Ofuk? ^^
Do you have any cribs to share that help you?