WEP can be cracked in under 10 mins - i saw a demo at university!
WPA is supposedly uncrackable by the same means as WEP (apparently) but there are other ways that iv been taught for educational means such as renaming your network the same as theirs, ur signal being stronger and unsecure - setup correctly with the right stuff it will send all their data via your network from which you can collect what you want
Wireless FTL tbh