Funny, the semi-acronym M-VEM-J-SUN-P always works for me. Oh, and VIB-GYOR for the rainbow spectrum. Weird brain, I guess.
Here's one I made up for figuring out whether the moon's waxing or waning: "If the light's on the Right, it's aRriving. If the Light's on the Left, it's Leaving". You've got to be able to rotate the moon in your imagination (or tilt your head) slightly if the illuminated portion seems to be mostly on the bottom of the moon's disc.