Read those pesky agreements when logging into a network.

As an experiment a UK based Wi-Fi provider added a "community service clause" to its usual terms that stated users may be required, at Purple's discretion, to carry out 1,000 hours of community service that may include: "cleansing local parks of animal waste," "providing hugs to stray cats and dogs," "manually relieving sewer blockages," "cleaning portable lavatories at local festivals and events," "painting snail shells to brighten up their existence," and "scraping chewing gum off the streets." – Of course, they did not follow through but it shows how much we overlook agreements when clicking through them to gain access to the Internet on a public system. Read all about it: People Accidentally Agree to Clean Toilets for Free Wi-Fi