I cleared a line at Walmart before. My son was around 7ish. We're talking 10 minute hang time cleared the line. I'm not normally extreme foul, but something I ate or whatever left something graveyard dead in my system. People that thought they were gonna get in behind me grimaced, grunted, and moved on hastily. If I was committed to having to pay for my goods, I'd have left too. Poor cashier. She was SOL.