Obviously, a staple of the MCU (Marvel Cinematic Universe) is to have a post-credit scene leading to another MCU movie. I know this scenario that I'm about to describe is unlikely but here we go.
The Avengers and Guardians Of The Galaxy are cleaning up some of the damage their battle with Thanos in New York, when a strange blue beam appears out of the sky, a figure then is visible within this beam- it's DEADPOOL. He's holding a box of chimichangas, “Sorry I was late, had to get some food while I was on my way from Fox, ” he says. Spidey begins to ask who he is when he says, "Don't question greatness, b*tch.” He then turns to the audience, “Oh, you're here too? Sweeeeet”, he says.
Well, that was it.