The older I become the more I understand the world is filled with interesting people. There is not much I can say about this pet peeve. Why? Why are you an adult and you are still sucking your thumb? I think the biggest problem about this is when someone does it in public. Really though? If anyone over 10 (I am being very understanding) still sucks their thumbs or finger that is not normal. FYI-Never say anything to someone who does this because they are very defensive. Just look at them and let your facial expressions say, “STOP IT! UGH”!