The tail. The deja vu. And I was counting this one not having a tail as the proof it's "not a sign". Comets don't have tails, other than the rare, large, named and periodically returning ones.
It's *very* unlikely that an unexpected comet appears on sky so bright and with a tail. Like a history defining one.
https://www.forbes.com/sites/jamiecartereurope/2020/04/01/a-bright-comet-with-a-tail-could-adorn-twilight-just-as-the-coronavirus-epidemic-peaks/
1-Apr-2020 11:57 am