The cash-and-carry apprentice at Batleys was making a delivery to Glens newsagent on Clepington Road last week when he tried to buy some crisps.
The grateful shop manager gave him his pound back, which Jack instead spent on a scratchcard. To his amazement, he scooped the £100,000 top prize.
“I bought a scratchcard on the spur of the moment,” he said.
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