-when the sound of a bandsaw cutting aluminum that once was deafening and painful becomes soothing to the ears
-when your hand continues to vibrate a bit and you feel like your using a dremel an hour after you finish using it for a LONG time
-when you find hard tables comfy to sleep on
-when you remember exactly what size wrench is for what nut and what allen key/screwdriver is for which bolt on your robot (almost)
-when you look at your bed in the morning and see lots of metal shavings on it