I've just done it with the dividers both in front of and after my shopping in Lidl and nothing happened! The checkout assistant just picked up the one in front and put it on the slidey divider shelf and got on with her scanning, and the woman behind me just placed all her stuff after the longways divider and went back to staring into space.
Ha ha! gotta try the booze/nappies game. I could get judged on neglect of my none existent DCs
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OTOH, pissing about with the minds of poor, hardworking supermarket staff seems a bit mean.