Couple days ago, I had a science lesson and we had to remember the different phases of a biological process. So the teacher did what all teachers do and wrote a way to remember them.
It was "I picked my arse today class"1, and everyone burst into hysterics after hearing that.
But there are other mnemonics taught in school, how I learnt the solar systme was "My Very Educated Mother Served Us Noodles"2.
They're meant to help you understand and they can actually work3 and are an interesting way of teaching.
 Hilarious I know.
 Year 2s rejoice (1st grade for the Americans in the audience)
 6 year olds have brains like sponges though so.