Does anyone fly Southwest Airlines?

Changing the Southwest Airlines boarding pass is as simple as downloading the appropriate HTML boarding pass page, and changing the graphic before printing at home before taking off to catch your flight. An interesting and – I’m sure – soon to be closed loophole for cheating the system.
I can’t believe I never thought about doing something like this. Any airlines which offer printable HTML boarding may want to reconsider.
Does anyone else know of any tricks for cheating the airlines system?
