I'll never forget the first pair of hiking boots I bought over 20 years ago.
I bought them in the morning in my regular size and wore them for a few hours in the afternoon to break them in before wearing them on an easy hike the next day.
Within minutes I could feel both my big toes rubbing on the tip of my boots. The pain intensified as the day went on and became unbearable on the way back which was downhill, further smashing my big toes into boots.
When I arrived home and took off my boots, my feet were covered in blood and my toenails had already started to blacken.
But I had spent a lot of money on these hiking boots which were now non-returnable since I'd already worn them. So after giving the blisters a week to heal and convincing myself that I just "need to break them in", I stupidly wore them again, and again.