Avengers Headcannons

Song

One day Natasha walks into the Avenger Tower, the song "black widow baby" blasting as she walked to communal area. She smirked and everyone groaned. The next day however Tony does the same thing with song "Iron man" so soon it turns into a competition between the Avengers to have the best theme song playing when they enter a room. It ends when Steve strolls in playing the  national anthem with a grin on his face