Had that too... even with a pretty heavy duty looking rubber plug! Don't remember any brand though, and it was Schuko.

Alan, your humor is incredible! I'm still trying to get up from rolling on the floor... thanks a lot!

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It's common here to pull the plug on something and bring with it the receptacle, the box, a tangle of wires and choc-blocks and with a large chunk of plasterboard attached.
Well, that's not too uncommon with Schuko either... at least where cheap boxes and receptacles were used. The clamps don't tend to hold up too well, especially if the box isn't plastered in securely and widens under pressure. But well... we're halfways in the balcans here... I'm used to it! Just push it back into the wall again...