Ways I've wasted my money
I was broke for most of my twenties, so I didn't get to waste my money on tons of things, but I was of course broke partly because I was misallocating my money :)
1. Getting drunk
2. Eating out
You gotta live life and eat out, but back when I lived in Paris, I didn't make a lot of money and it would have been good to save up and/or invest my money into something useful such as courses or a side hustle.
3. Coffee shops
I used to go to coffee shops every day, justifying it by saying it was a good place to get work done. Considering the money I was earning, it was not smart at all :)
I was never smart about grocery shopping.
5. Expensive hostels
While traveling cheaply, I ended up spending a lot on hostels that were way above my budget, especially in the US.
6. Flights that I didn't take
Happened a couple of times recently. One was around 10€, I knew I might cancel it. The other one was because I ended up finding a cheaper way to get back home (I canceled Abu Dhabi - Santorini because flying from there to Brussels was quite expensive, and did Abu Dhabi - Sarajevo - Billund - Brussels instead).
7. Online courses and products I haven't used
I can still use them though, so when I do, it might not be a waste.
8. DVDs as a teenager
Well, my mom wasted money on it. I guess it made me happy though. Did it?