d’Armond Speers is a strange father, in fact, since his son was born, he had spoken to him in Klingon, until his age of 3 years. The Klingon is a fictional extraterrestrial language having the same name of the Star Trek universe.
Speers said he made this experiment to better understand how children learn languages. During that time however, his wife communicated with her child in English. The child had, indeed learned this fictitious language, but as growing up, he got bored of the way his father talked to him and started refusing to answer him, eventually forcing Armond to stop.