Frost and Cisco in “Unfinished Business”

I'm sorry. Crisis is over, we beat the bad guy, and you're still worried because...?

Cisco

[somewhat tense and agitated] Because... an infinite number of Earths experienced a cosmic heat death from which only... one Earth was rebuilt. So now, not only do Superman, Supergirl and Black Lightning live here, but now our entire timeline has been rewritten so that they've always lived here, and I don't remember owning this shirt!! [rips open his outer shirt to reveal a Superman logo t-shirt underneath]

Great shirt.