Possible Clues:

• Whim
• Unexpected and inexplicable change
• Unpredictable change
• Capricious idea for a gravy
• Silver in change? Fancy!
• Unexpected change in one's behaviour
• Unpredictable change, or a freakish prank
• Unexpected and inexplic-able change
• Fancy a grand change will come about
• Fancy having silver in change