For me there are two kinds of bugs. The ones where you lean backward and the ones where you lean forward.

If you found a bug and you lean backwards in your chair resting your hands behind your head you feel proud and relieved that you found that sneaky bastard. Good for your dev soul.

If you lean forward, resting your forehead on your fists or on the desk then it was a very stupid bug. Not sneaky at all. Something plain obvious. It makes you doubting all your career and life choices you made so far. Like needing one hour to find out that you named the "MANIFEST.in" accidentally "MAINFEST.in"...

Want to share any embarrassing bugs to make me smile again?

When the fire alarm at your company goes off and instead of saving your life or thinking about your family your first thought is

git commit
git push

...

Having to debug a program on a batch of 5000 punched cards and needing days to get them to the data center per mail.
Then you wait days to get the result just to see that it threw an error so you begin to debug what basically means that you change something in your 5000 cards, send them back, wait days, get an error again, make a change... send them back and so on...