Package delivery options

If you:

1) Are ordering an important package
2) Will not be home to receive it
3) Don't trust your neighbors/neighborhood

You can have the package sent to your workplace, whose hours of operation likely include the standard time of delivery and will most likely have no problem holding onto it.

Holding doors

When entering/exiting a building, always hold the door for you as you walk through it. If someone's behind you and you let the door half-close in their face you will look like a jerk.