It's rude to use other people's wifi.
Karla's home Wifi stopped working, and she is driving around looking for a signal.
Karla wants to check her email.
Karla sees a public library that is open and goes inside to use the Wifi there.
Karla notices an unlocked Wifi network outside of somebody's house and uses it on her laptop.
Karla gets caught up with her messages and is able to drive home without issue.
The home owner comes outside after a while to ask Karla what she is doing and tells her that she must leave immediately.