What used to be simply unacceptable. Think of how we now laughed at.
1 In the salons of the XIX century it was considered unseemly for a man to invite a lady to dance more than 3 times. After the second dance he had to announce their engagement.
2 In the US, women still never "suggest marafet" in public. It is considered impolite, as well as a look at the people in the mirror.
3 gloves were once purely home accessories. Despite the fact that the gloves were a great many (sports, ballroom, hunting and special gloves for lackeys) Wear gloves only at home, as the people doing it was considered indecent.
4 In the 20-ies of XX century in Russian schools was considered indecent to write correctly, because it was not a proletarian. Literacy can even write a denunciation.
5 In the UK it is indecent to knit in public. Although, it is possible to tell stories related to knitting. By the way, recently in the UK addicted to knitting men. Knitting has become the third after football and politics topic in bars and pubs.
6 In Bulgaria, for a long time it was considered unseemly for men to drink less than one and a half liters of wine a day. Wine in Bulgaria worth a penny, so that a moderate its use has long been considered a sign of starkness.
7 During the Japanese tea ceremony is considered improper to sit cross-legged. Pulling the legs toward the neighbor - is the height of familiarity. Therefore, participants in the ceremony are sitting on their own heels.
8 By the way, with regard to Russia, at the turn of XIX - XX centuries. considered absolutely indecent acquire a cottage (this concept already existed then) plots of less than 10-12 "ar".
9 According to the rules of etiquette, which operated in the Russian boyars' estates, for all occasions, talking to someone, was considered indecent to become half-turned to the man. Included in the living room lady ought not to be closely inspected from head to toe, as this can put a modest person, especially a woman, in the most embarrassing and deprive it of any self-control.
10 In Thailand, considered indecent touching ready interlocutor and pat him on the shoulder. This is considered to be tender, and public display of tenderness in Thailand - indecent.