One of my favorite writing prompts books is Room to Write by Bonni Goldberg. Here is a prompt I like. Paraphrased:

Choose a phrase you hear a lot. Write it. On the next line, respond with your first thoughts. Now write the phrase again and your response. Do this fifty times. Rewriting the phrase is a natural reboot, prompting a fresh response.

I like this rapid-fire exercise because it’s designed to keep you  moving from one first thought to the next, pushing the editor away. 

Some phrases you might hear a lot:
I love you
What do you mean?
Can I help you?
Wait a minute
I’m fine

I’ll post what I come up with.