Hire and fire culture, where no one is safe if it'll save the company a couple of pennies. You'll joke about the monthly "culls" with your co-workers through gritted teeth cus everyone's on edge, until you're let go yourself.
Weird environment, lots of drinking and a bit of an excessive drug culture.
Fast-paced doesn't begin to describe it. You'll be forced to drop everything you've been working on, according to the founder's whim, blamed when it doesn't work out, and then praise upper management for their better ideas - which were what you said to begin with. Everything is "Sell! Sell! Sell!" with very little awareness or even thought.
Some clique-y groups of staff, but that's nothing compared to the weird inner circle thing that the founder has going on with his school friends turned spies.
You'll totally lose yourself and your sense of morals.
Product is kinda just... Nothing? Really cool tech that is totally underutilised but the actual events you're selling are basically pointless.
I have developed an intense aversion to anyone walking behind me (especially if they click their fingers), it fills me with dread.
Work-life balance is not much of a thing there.
It's just a really odd place. Actually, you should get hired there just to experience the weird icky environment, it's indescribable.