> because some tester opens a ticket saying you can enter an invalid email in the email field?
This is the source of 80% of all "bugs" I've fixed over the years.
Another personal favorite: If you enter WWWWWWWWWWWWWWWWWWWW W WWWWWWWWWWWWWWWW for name, it messes up the layout on the display screen.