Not verifying the load capacity of a customers vehicle.
My past job made the customer sign off the paperwork before we loaded them up and this guy did sign off on the paperwork that his truck could take the load. So, I wasn't technically liable. I was newly certified and was the only driver around that day. We were a small shop that only took a few deliveries a week, and customers wanting samples back after delivery was even rarer (destructive testing is fun!).
Since I was new to this, I didn't intuitively know the difference between a flatbed and a normal passenger pickup. So yeah. In my ignorance and with this guy's sign-off in hand, I try to load his ~1000lb pallet of bigass metal test samples into his. Personal. Pickup.
The truck just kept squatting and squatting, even though I still had weight on the forks.... until it finally made a horrific creaking noise. I immediately unloaded the pallet and went to apologize. The guy was mortified but he kept it cool and called his actual delivery guy to come with a flatbed the next day. I did that one too, thankfully his delivery guy just cracked up when I explained what happened (even gave me some quick advice too!). They kept doing business with us, at least, but his reaction in that moment is still seared into my mind.
Ignoring the price change itself. The original switch launched March 3, 2017. The only excuse for this thing costing more than about 90 usd pre-tarrifs is due to the outdated hardware being so old and hard to get (though knowing nintendo they have tooling in-house for "reasons").
Do people just seriously not give a fuck and buy this ancient thing because of the exclusive games? I mean, I get it, nintendo are royal pieces of shit for locking all their games down inside of a captive platform. But that's a great reason not to buy this shit.