Use 'by accident' when something happens without a plan, like running into a friend while shopping. I found this rare book by accident when I wasn’t even looking for it.
Pro Tip 2/3
No Fault Implied
'By accident' implies no blame; it's used when the outcome wasn't on purpose. He deleted the file by accident, not because he was careless.
Pro Tip 3/3
Positive Surprises
Sometimes 'by accident' leads to good outcomes, like discoveries or new experiences. They invented the sticky note by accident.