Should we used our thumb print to unlock our phones or pattern? A guy security passages to his Samsung galaxy edge is his thumb. There were rumors about him having an affairs with a younger girl. His wife confronted him several times but he denied it. One night while drunkenly atsleep, his wife used his thumb to open his phone. Opss… It was hardly disheartening. Naked pictures of the love birds, fun videos of their activities and schedules of their next meeting. She copied what she  wanted and locked the phone. 

Three days later,  on a Friday night, she walked directly into their meeting in a pub bar and caught the two…. 

The used of his thumb led to his wife finding out about everything including their next meeting. From this incident, I think patterns are more safe.