[ He looks a little confused by Stark’s laughter and that poor attempt at hiding it, but a quick glance at Groot, who’s still sulking, doesn’t yield much. ]

... Right.

[ And he drags the word out with obvious suspicion. ]

I’m just saying, you're definitely gonna jinx yourself with that.

It's like saying, “What’s the worst that could happen?” or “At least it’s not raining.”