Debugging - It’s Really Bugging!!!
Ever notice when your code doesn’t work, you spend a week trying to debug it, trace the problem, bang your head in frustration, veer on the brink of suicide, and finally find out what you think was the problem? You correct it and find out that it still doesn’t work. Go back and repeat, until you find out that it was one teeny tiny stupid mistake in some obscure location in some other module?