Possible Clues:

• Recall aids such as Roy G. Biv
• Aids for retrieving things
• Certain mind tricks
• 'My Violent Evil Monster Just Scared Us Nuts' and others
• ROYGBIV for rainbow colors and HOMES for Great Lakes, e.g
• "Silent" recall instigators
• Recall aids
• Recall instigators
• I before E except after C, and others
• 'Every good boy does fine' and others