Humans descending from the trees was pretty disastrous for all involved.
I’d say the biggest blunder was probably the Romans allowing themselves to be encircled at the battle of cannae. Can’t let yourself be flanked. That’s like 2nd millennia BCE shit.
And Napoleon and Hitler pushing pawns to Russia
In the beginning the Universe was created. This has made many people very angry and has been widely regarded as a bad move.
NASA thought that warnings about O rings from it engineers were overblown and sensationalistic.
The Warner Brothers thought George Lucas’s idea for a space movie was a crock of shit
Coca Cola attempted to sell soda without artificial colouring.
Pharmaceutical companies were given leave to perform their own safety studies and to advertise directly to consumers
Cadbury replaced quality ingredients in their chocolate with palm oil.
The Democratic National Committee decided to sabotage Bernie Sander’s candidacy.