Used a wrong filter during loading of a table in ETL. Did not test and migrated to production. 80% of users had empty reports.
Had to stay awake till 4AM to get it fixed.
Realized an important lesson -

' A test in time saves nine'

Project managers wants everything to be completed 'yesterday'!

went to a hacakthon after a long time.Thoroughly enjoying the adrenaline rush for coding and the utterly geeky conversations.

Code runs flawlessly in DEV and QA. Fails only in Production :-/

That helpless moment when you type 'rm -rf *' in the wrong directory coz you misspelled the directory name!