One cashier was rolling their eyes at this incredibly unaware customer who just couldn't seem to focus on the task at hand. Wake up, Karen, it's time to pay for your groceries, not blab with your friend! On the r/Talesfromretail subreddit, one frustrated grocery clerk shared the daily struggle of just getting customers to listen to them. On an unexpectedly busy day at the store, the cashier wasn't able to leave their post for a second due to the massive influx of customers. But still, when this…