TBF David is portrayed as the underdog in that story. IIRC Goliath had armour and may have had ranged weapons as well, but David got lucky (through divine intervention) with a difficult, imprecise weapon.

"If I was dictator for a day", "who made you king" and so on. Autocrats have a lot of power, but it's always leaky as hell and their position is always precarious. In some ways they're just the first among prisoners, since if they ever go against the system itself they're out as fast as Gorbachev was. None of the top officials want their skeletons coming out.

"You cannot have a cake and eat it too?"
Bruv, if I have a cake in my hands, I am going to eat it.
It's like me giving a back massage to my girlfriend. Things are going to get groped.
Yes, I have a girlfriend. I will not be taking any questions.

There are a number of idioms that MythBusters tested, some of which were disproven and some of which were confirmed/plausible.

It is easy to punch out of a paper bag.

10 pounds of poop will not fit in a 5-pound bag.

People can easily recognize the backs of their own hands.

Taking candy from a baby is not as easy as it sounds.

People may literally get cold feet when they are scared/timid.

If poop hits a fan it can indeed create a large mess.

You can teach an old dog new tricks.

With an enormous amount of force, it is possible to literally knock someone's socks off.

In a race, it is not literally better to hit the ground running.

You can polish poop.

Shooting fish in a barrel is fairly easy; the shock wave from a bullet can be enough to kill the fish.

A bull in a china shop will actively avoid hitting the shelves.

A rolling stone truly gathers no moss.

Finding a needle in a haystack is difficult, even with modern technology.

[EDIT: a couple of other idioms not in the idiom section of the link.

It is possible to make a balloon out of lead.

It is not possible to herd cats.

A goldfish's memory is not limited to three seconds.

]

Not quite an idiom, but one of the senior managers at work keeps talking about Moore's Law in the context of AI stuff like it's some kind of fundamental law of the universe that any given technology will double in capability every 2 years

1. Moore observed that transistor density in microprocessors had historically been doubling every 18 months, and this trend more or less continued for a decade or so after he noted it
2. Density has nothing to do with the capability of technology that uses those microprocessors. The performance of the chips roughly doubled every couple of years, but there was a lot more going on with that than just transistor density
3. Moore's law hasn't held for at least the last decade

I hadn’t heard this take. Did David cheat by using the slingshot? Was that not allowed? Was this like a duel with rules?

There is a "learning curve" to it - used as "it will be easier after a while. It's the other way around. Learning curve is when you learn like crazy at first, but than after you knock out all the easy wins your progres slows dramaticaly.

If you can't kick down a lock then rain fire-shit