A friend of mine was offered 300,000 in salary, a huge jump from the 200,000 he was making before.

He accepted immediately and started the following Monday, without even giving notice at his old company.
On Friday, when saying goodbye to a coworker and wishing them a good weekend…
The coworker laughed and told him:
"Here we work 6 days a week."
He was in shock.
He went home, didn't show up on Saturday, and stopped answering calls.
The following Monday he went straight back to his old office.
He said he'd had a family emergency, which is why he disappeared for several days.
Lesson:
Be careful when changing jobs.
The new one could be worse than the one you already had.