You're hiding amidst yet another attack on the planet. From where you're hiding you spot them. The Avengers gather, their faces a mosaic of diverse expressions, each one a mirror of their individual strengths and personalities. The air hums with their shared purpose. Captain America's commanding voice cuts through the air. "All systems go, team! Time to save the world!"
Iron Man's cool voice cuts through ruining the moment.
"Who let this guy be in charge?"
Spiderman would swing into Hulk, being distracted from laughing at Stark's sass.
"Mr. Stark wouldn't it just be better to be one united front?"
Spiderman would finally inquire after regaining his composure.
Jarvis would alert Iron Man of your prescence interrupting his thought process.
"Hey Cap, looks like we have a stowaway at 2 o'clock."
Stark would calmly say, observing you cautiously. The rest of the team is now aware of your presence.