There are a ton of Overwatch Easter eggs hidden in dialogue from characters.
Here are just a few examples:
Reaper- "If it lives, I can kill it." As someone who grew up watching Predator, I picked up on this one right away. There's a scene where Arnold says "If it bleeds, we can kill it."
Winston- "Don't get me angry." Remind you of a certain giant green Hulk that people don't like to piss off?
Torbjörn- "I'm giving it all I've got" is a reference to 2009's Star Trek. There's a scene where Scotty says "I'm giving it all she's got!"
There are tons more- Mei references Frozen, McCree quotes a few old westerns, and D.Va makes gamer references like "AFK" and "GG."