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an idle brain is the devil's workshop
When one has nothing to do, one is more likely to get into trouble. When I'm off from school, my grandmother is always trying to get me out of the house, while reminding me that an idle brain is the devil's workshop.
idle hands are the devil's workshop
When one is unoccupied or has nothing to do, one is more likely to cause or get into trouble. Idle hands are the devil's workshop, so is it any surprise they started causing mischief after being left to their own devices for so long? We try to keep our kids busy with various jobs and activities during their summer break. Idle hands are the devil's workshop, after all.
The workshop of Santa Claus, where Santa or his elves are said to make the toys that he delivers on Christmas. I'm sure the elves in Santa's workshop are making the toys you'll get for Christmas right now, honey.
See also: workshop
idle brain is the devil's workshop
Prov. People who have nothing worthwhile to think about will usually think of something bad to do. We need to figure out something constructive for Tom to do in the afternoons after school. An idle brain is the devil's workshop.