At a previous job I bumped heads with the IT person a lot because he would spread misinformation about technology so the owners would never replace him. This was conversation with the VP:

VP: Hey I just got a new security setup at my house and I can monitor everything with my phone.
Me: That's cool.
VP: I'm rethinking it because [IT guy] said it was very dangerous to have, what do you think?
Me: ....? What did he say was dangerous about it?
VP: He said hackers could then gain access to cameras and plan the perfect time to rob me since it's in the cloud.
Me: I seriously doubt anyone is planning an Ocean's 11 heist to steal your TV.
VP: Yea I thought it sounded weird when he told me.

*In the final weeks of development with a project on a short timeline because the client "needs it".*

Client: "We've hired a consultant we want you to work with."

Me: "Okay, can we push this to after the delivery?"

Client: "Of course"

Wake up to an email from the consultant with a list of scripts he just ran on the production database server for the currently live app.

Get follow-up emails about bugs and app crashes from the client.

My rage is so hot it can keep warm an Eskimo tribe over the winter season.

A world without Java...

https://youtu.be/viWZ0Ocp30c

Client: We want to onboard people with sign-up wizard just like (Massive Industry Leader) so remove the sign-up process from the app.

1 week of development later...

Client: We need to take photos of their information, but we think its easier to take photos on the phone so once they sign-up link then to the phone.
Me: How will they get the apps if it not in the app stores?
Client: Get the apps approved for the app store! duh!

2 weeks later... 4 failed app submissions..

Client: Would it be easier if we just add the sign-up on the app?
Me: Yes... like it was 3 weeks ago?
Client: Yes! Why did we remove it?
Me: You did in an effort to be more like (Major Industry Leader)
Client: ....but we're nothing like them! Change it back!
Me: >•<!!!

I have to fire my client...

When my client asks why we can't code to avoid bugs on delivery

Client: it's very important that we go live with the app's sign up process.

Me: ...but the mobile apps aren't complete yet.

Client: Yes, but marketing says we need to start getting downloads and sign-ups so we get better ratings than our competitors.

Me: ...but the user won't be able to do anything.

Client: We'll add the rest later when we have users!

Me: Could you please provide us with api key so we can add this feature?
Client's IT person: You don't need the api key to develop, their site has documentation so it's not a blocker. I will get you the api key when we are ready to go live.
Me: ...