Like Dave Hunt 12 Jan 18 - 10:51 I have difficulty reading Bass clef when not actually sat at a piano. But over on the Mnemonic's thread (tried to make clicky - it didn't work) From BobL's piano teacher in the 1950s:
Every Good Boy Deserves Favour (notes on stave lines in treble clef)
Great Big Dogs Fight Anything (ditto, bass clef)