People Who Walk In Straight Lines

On the bus home today i was thinking about professions/things that require you to walk/run in a straight line. i got quite a few
-gardener/lawn mower
-catwalk model
-tightrope walker
-pirate/captive of pirate (walk the plank)
-pole vaulter
-long jumper
-treasure hunter
-30 steps West X marks the spot
-that circular metre thing that you roll on the ground to estimate distance job
-pageant girl
-flight attendant
-people who do regular shopping with tha trolley down tha aisles
-bowling
-cricket
-softball
-baseball
-t-ball
-all those ball sports
-100m sprint
-that playground game where you play tip along the marked lines
-floorboard sander
-old fashioned farmer (plants his crops by hand, in lines)
-train/bus ticket inspector (walks down the aisles)
-silverchair
-compulsive brides
-compulsive grooms
-the aboves flowergirls
-line dancer

ahh i know there were heaps more but they've already escaped the grasps of my mind i really enjoyed thinking about this its a fun topic and i almost missed my stop because of it