They've been trying to work/get the 'bugs' out of the system. [=trying to fix the system's problems]
He was first bitten by 'the' acting 'bug' [=he first became interested in acting] when he was 18.
Her legs were covered in 'bug' bites. [=itchy or painful wounds from insects]
(..) Why are we laughing? Take aim. Fire. Well, light the... thing! I did! Fear the bug! Get the weapon! Tigress! You... You were there. Yes. Yes, I was. - You just let Shen get away! (..)2011 Kung Fu Panda 2