We have made one here to help you remember the seven layers of the OSI model:

The Layers:

The Mnemonic:

“All Pretty Serious Teenagers Never Do Physics”

Note that there are two 'P's in the sentence.  The mnemonic has taken the first two letters from each, and used a word that starts with the same two letters e.g. Presentation layer uses the word Pretty  and Physical layer uses the word Physics.

Have a go at coming up with your own Mnemonic, you may find one that works better for you.