Question: How did Willy Wonka know that Charlie and Grandpa Joe had stolen Fizzy Lifting Drinks? The entire time they were in the room they were completely alone and security cameras obviously didn't come into existence at the time.
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Answer: Closed circuit security was invented in 1942 and came into common use in the late 60s and early 70s. Beyond that, Wonka could have had Oompa Loompas monitoring the group or simply noticed that they were gone and guessed.
Greg Dwyer