on or off the plane....
people who pull their mouths open to one side, showing those deep cavities and ask how much to fix those... my husband hates that..
one guy proudly told him just to save himself from future pain, suffering and high dental costs, had all his teeth pulled and now been wearing upper and lower dentures for years... my husband really really hates that...
unless he is sitting next to one, now my husband rarely tells strangers he is a dentist...