Got a Better one.........
When we first come over here....hubby had been in the shower....and sat in a chair like this....to towel his legs dry......
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He stood up....and the chair came with him.........

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One had managed to slip down the gap and wedge itself in.....
I didn't know whether to help slide it out with some lubricant....or shoot him before the Neighbours heard him screaming....
Don't sit on slatted chairs with no undies on.....................Ever....