The magician shows some cards, one shows a picture of a lemon on its face.
This is set aside, face down.
To make sure there is no confusion, the remaining cards are dealt face up and seen to spell the word “LEMON”.
The performer rearranges the letters to spell “MELON”.
And when the picture card is turned over, it now shows a melon!
EASY TO DO. COMPLETE WITH SPECIAL CARDS!