You are never completely immune from what some might view as slap stick when your getting your hands dirty building stuff.
Be it dropping a screw into the colour matched blue metal,
Cutting an upright too short,
Losing the connection between the extension cord and your drill,
Dealing with twisted timber,
Using your head to steady a length of timber because your knee and hands are already in use and you still need your other leg to maintain some sort of balance or eventually
Upending an entire box of screws into the camo blue metal.