i guess she wasn't impressed with his "Thumb up the Butt" trick patented by Houdini.
Houdini would stand behind a male volunteer from the audience and get him to drop his shorts & underwear.He would then give him the thumb and when the volunteer said "ouch!.Yes I feel it"....
Houdini would show both fists & thumbs while still standing behind him.
"Tah-Dah!!"