“1: "I think I've got the 1" when we're trying to sort out your change, don't offer to give us the 1p .  It's really annoying because we then have to put all the change back in the till, figure out what it is you're trying to do, then redo your change.2: "I've got the exact money somewhere..."  Not always an issue, if we're quiet.  But if we're busy, and short staffed, it's really annoying because it means the customer behind you will blame us for them having to wait an extra minute or so.  3: Scanning items for us.  This one is just really annoying because if you miss the reduced sticker, it's actually your fault, but you will blame us when you read your receipt.4: Taking a bag.  Not annoying, just makes us feel like sh*t for not offering you one first.5: "I'll pack for you!"  NO NO NO!  Because you'll always take one thing I haven't scanned!  ”