My top 3 biggest pet peeves as a cashier

Just as the title says,

1.) When someone comes up with a full cart and just stares at you.

2.) When you’re checking one customer out and another one comes up behind you and just stares at you until you get done.

3.) When a customer comes to the register up on the phone.

Can’t stand any these. I’m interested to hear what y’all’s is as well?