 
<translate> Muhimmin bangare don amsa wannan tambayar shine: "Zan kasance kawun biri" an ce ya kasance daga bayan 1925, ranar da aka yi wa Scopes Trial a Amurka, inda kalmar ta fara bayyana. Saboda haka, amsar ita ce Shari'ar Scopes da aka yi shelarta sosai a Amirka. <eng> The important part for answering this question is: "I'll be a monkey's uncle" has been said to date from after 1925, the date of the widely publicized Scopes Trial in the United States, where the term first appears.
Therefore, the answer is the widely publicized Scopes Trial in the United States. 