The reason for the cement is to keep the victim in one place, rather than being able to go and hide. The bucket and cement is not necessary for this, but some form of anchor point can be effective.
Just for a bit of fun/excitement, I've done something like this to myself -- locking myself outside, naked, handcuffed, and blindfolded until keys frozen in ice thawed (with a backup set placed someplace else outside, where I'd either have to wait until dark or be seen to retrieve them... just as an extra disincentive)
The blindfold makes it extra-exciting if you're into that sort of thing. Even though my yard is private, when you're blindfolded every rustling sounds like someone walking by....
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