Knock back a beverage of your choice every time...
There’s a shocking death, or a gob-smacking revelation concerning a character’s identity.
Saru’s threat ganglia pop out. Someone says fuck or shit.
Tyler gets all watery-eyed with emotion.
Lorca winces at bright light.
A human somehow manages to kick the ass of a Klingon.
Tilly jabbers on and on until someone makes her stop.
One of the minor bridge crew gets a reaction shot (but not actually a line…)