Note: This is my speculation as to what the post-credits scene from "Ant man and the Wasp" will be. I realize I could be wrong, we'll see.
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Scott ran to his ex-wife Maggie's house. Technically he was breaking house arrest by leaving without permission, but the officer he was talking to just dissapeared right as they were talking. Scott saw chaos in the streets, many others running in search of their own loved ones. Some would be reunited, others wouldn't. Whatever happanned it seemed to have happanned all over the world. Clearly the police had bigger problems than Scott Lang breaking his house arrest. Right now Scott had to make sure his daughter Cassie wasn't one of those who dissapeared. Scott ran inside and there was his ex-wife, crying, and with a gun in her hand.
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Scott: She's gone, isn't she?
Maggie: Yes. I was just making her lunch, and I watched Cassie just dissapear. Paxton dissapeared too, this was his gun. What exactly was this?
Scott: I'm not sure. Some are calling it the rapture, but it seems to be completely random.
Maggie: If my child is dead, I don't want to live. There's more than one bullet in this gun, you can use it after me if you want.
Scott: Maggie, I can fix this.
Maggie: How?
Scott: I've heard a rumor about come wizard, they call him dr Strange. They say he has something called the "Time Stone." With it, I can go back in time, stop whatever happanned from ever happanning.
Maggie: How do you know it's not just a myth?
Scott: If it is, I'll spend the rest of my life searching for it.
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Scott barely noticed as his cellphone rang, then he realized it was Hope Van Dyke, AKA the wasp. Maybe she had a better idea where dr Strange was.
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Scott: Hope, I assume you know what happanned.
Hope: I was having dinner with my father, and he dissapeared.
Scott: It seems to be all over the world.
Hope: All over the universe actually. I spoke with Cap, he knows who did this. He says he has a plan to reverse this, bring them all back.
Scott: And you need my help. Absolutely, whatever you need, I'm in. My daughter dissapeared too.
Hope: I'm sorry. Hopefully we can bring her back too.
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As this call ended Scott spoke to Maggie again.
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Maggie: Was that one of your superhero friends?
Scott: Yes. She says they have a plan. I don't know all the details, but we can reverse this whole thing.
Maggie: I don't need details. Just promise me you'll bring our baby home.
Scott: I promise you I will either bring her home, or I will die trying.
Maggie: I know you will. But if it's the second one, I will use this gun on myself.
Scott: Guess I have everything riding on this.
Maggie: Me too.
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Before Scott left to meet Hope Maggie and Scott shared a kiss. Maggie wanted to wish Scott, good luck, and they both needed some comfort right now. He would either return home with Cassie, or he'd never return.