Greg does this magic trick in Big Red Car.
Greg goes to a small table behind him and gets a bag with magic hankies in it. He shows the inside of the bag and there's nothing there "hello hello". He waves the wand over the bag and then reaches in but there's no magic hankies! He shows everyone the inside of the bag again and it's empty. Oh, he forgot to say the magic words. How silly. He asks the audience if they can all help him say the magic words which are "Wiggle Waggle." And wave your fingers in the air at the count of 3. Greg counts to 3 and waves his fingers at the bag, saying "Wiggle Waggle!" Greg looks surprised. He reaches in and pulls out a pink hankie. Let's try again. He shows the bag is empty and then readies everyone for the count to 3. 1, 2, 3, Wiggle Waggle. Greg reaches in and pulls a green magic hankie. Let's try one more time. Maybe they can get a big magic hankie. Here we go, 1, 2, 3, Wiggle Waggle. Greg pulls out a huge magic hankie. Put your hand up if you did that. Wow, it's bigger than I thought.