Teacher Nelly, clicking sounds are also known to be contagious. I read in a book that European travellers in South Africa started using clicks in English:)
Here:
"He cites Miss Lloyd's statement to the effect that it was difficult for her, after long contact with the Bushmen and Hottentots, to refrain from using clicks when speaking English. Certainly clicking is to some extent "contagious", and I have often heard Europeans in South Africa sportively substituting clicks for other consonants when speaking English, in imitation of the Hottentot or Zulu. I am certain that clicks were thus introduced on a fairly large scale into Bantu by the Zulus and Xhosas and that clicks are now used in many Zulu and Xhosa words that were not borrowed form Hottentot or Bushman."
Douglas Martyn Beach, "The Phonetics of the Hottentot Language", 1938