XKCD comes up with a few mnemonics, including one for the solar system

Years ago, right after Pluto was demoted, I created a juvenile new mnemonic for remembering the solar system.

solar system:
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

The mnemonic was:
Many vegetarians eat meat, just show up naked.

See, the first letters match.

Finally, someone else, someone actually talented, has taken up this pressing problem. Of course, I refer to the XKCD guy. Who else?

He says the "traditional" was
My very excellent mother just served us nachos

He invents
Mary's "virgin" explanation made Joseph suspect upstairs neighbor.

Ding! Ding! We have a winner!