The DU Lounge

These people are so absorbed in their own personal worlds the don't consider how what they're doing affect others.

A few examples:
People who enter a supermarket or store with a shopping cart stop between the doors or just inside the door block others so they can check their purse or something else.

People who immediately get up from their seat when a plane lands so they can be first off. What that actually does is delays exiting the aircraft for everyone. If people in the front of the plane first would go first then the plane could empty faster.

The person in a checkout lane or self-checkout lane who are ringing up their purchase remembers they forgot something and decides to go get it tying up until the return and complete their checkout.