I had heard about, but never seen the shot of the first computer bug ever. So sorry for those who have seen it, but maybe it bears repeating anyway.
The first bug reported in a computer was a moth that flew into the relays of the Mark II, the world's second large-scale automatically sequenced digital computer (following the Mark I of course) (subject to some debate I think).
The term stuck, and the word "bug" refers to any unpredictable problem causing a computer error of some sort. Only a true geek would save the damn bug. But that's Grace Murray Hopper for you. (She also coined the term "debug" - a true geek pioneer.)