ugly baby moment
From the Seinfeld episode in the Hamptons when Elaine first sees her friend's baby in the crib ... her reaction is scrunched face and exclaims, "ewww." Afterwards she tells Jerry she couldn't look, that the baby looks like a pekingese, he saw baby too and says there is too much water in that gene pool, hysterically funny!
Anytime you see someone who is ugly and it really takes you aback you're having an ugly baby moment.