Stargate: the episode where uh. They go to a spaceship and do stuff. Yes. Season 4 sometime. Jack and Sam (whom he'd been flirting with on-off most of the season, inbetween making sheep eyes at Daniel) and Sam's father, Jacob, are in an elevator on their way to the Gate. They stop to pick up Daniel who's struggling to pack a bag full of books, and Jack goes to help him carry them into the elevator. Daniel and Jack bicker amicably about the number of books he's carrying ("Well yes, I'll just go to archeologist-dot-com and get Ancient Phonecian on cd-rom") and then Jack sorta leans in close and pushes Daniel's glasses (sliding down his nose) back up and Daniel smiles a little crookedly and they're just looking into each other's eyes and alone in this world and close, and in the background, Jacob looks at Sam with his eyebrow raised and she shrugs, and there's a whole conversation (I thought you and Jack..? Nope. Jack and Daniel, dad.) right there.

Stargate has lots of slashy moments but that one is just. pure flirting and love and closeness and wonderful.