I keep hearing stories that are always about a friend of a friend so classic urban myth territory really that go something like 'my friend has got coronavirus and they and their partner were in total isolation for two weeks only taking in the supermarket delivery and post so they must have got it that way'.
I guess this is aibu really because aibu to think that this is very very unlikely and they or their partner must have been incubating it for a long time or have been out at some point?