The first time I remember absolutely losing my suspension of disbelief was at the end of the first Mission Impossible reboot where Tom Cruise puts an explosive on a helicopter he's hanging on the outside of that's flying behind a train through a tunnel, and the explosion completely destroys the helicopter and flings him onto the back of the train. Yeah, that helicopter (which probably couldn't be flying through a train tunnel to begin with) was made of far tougher material than Tom Cruise. Any explosion that destroyed it, would have turned him into a stain on the wall of the tunnel.

There's this scene at the start of War of the Worlds where the hero races his classic muscle car up this tiny neighborhood street at full tilt, exhaust notes at full blast, and I think he even screeches the tires by slamming the brakes pulling into the driveway. Then he walks up to his neighbor and they're all chill with him. In any other world, the neighbors would have him in handcuffs.

The law, in basically everything.

Hacking. Each and every time it is part of a movie or TV series.

Hacking.

There is no way that you keyboard danced for 12 seconds and completed a nmap scan, identified an unpatched target with a remote code execution bug, delivered the payload, pivoted to an account with the permissions you needed, and found the server running the internal application you are looking for.

I just fired a gun right next to your head, neither of us was wearing ear protection, and now we're having a conversation at normal volume and we can understand each other just fine.

Bonus points for grenades going off indoors, and nobody having a concussion after.

Where in countless mystery/thriller stories bad guys arrange meets in huge open deserted buildings, to be uninterrupted. In the real world, the place will securely locked and gated, or multiple houseless people will have already moved in there.

Boffins coming up with a magical new solution to a problem that they somehow know will 100% work despite having done zero experimentation or testing.