In the first episode of the 2020 Animaniacs reboot, the Warner siblings sing a song about what happened between 1996 (when the last episode took place) and 2017 (when the reboot was being written). At one point, they sing "We run out of jokes... to tell about the 90s", while showing them standing in a pond. However, Wakko is wearing something interesting:
What is it? It looks like a muzzle, but why would he be wearing it, while Yakko and Dot are wearing typical clothes for the 90s (probably, my knowledge about typical 90s fashion is incomplete at best)?