Overnight (our night) there have been strange reports coming in from agricultural hubs around the world. Cows and similar bovines appear to have all at once changed their signature "moo" sound, puzzling farmers, biologists, and even physicists. The sound these bovines are now making has been described as follows:
spoiler
GOOOOOOOONseeGOOOOONseeGOOOOOOON
Edit: it appears that birds capable of producing human sounds have also begun what can only be described as a chant