In Germany we ask apprentices to fetch a spare bubble for the spirit level.
Other classics are in aviation asking them to grab a bucket of prop wash, and then the numerous automotive ones like blinker fluid, muffler bearings, etc.
We used to have ramp newbies handle the lavs as a sort-of right of passage. The Lav fluids we called “blue juice.” One day I told a newbie to go to maintenance and get a bucket of “red juice.” He disappeared for an hour. We were wondering where the hell he went about when he showed up looking a bit stressed out, actually carrying a bucket of red fluid of some sort. Apparently he started going around the entire airport’s maintenance shops asking them one by one for red juice, none of them knowing what the hell he was talking about. Instead of asking for clarification over the radio he just kept going. Eventually somebody in a completely different concourse poured some hydraulic fluid in the bucket for him. I was a bit astonished and then had to figure out what the hell I was going to do with a bucket of hydraulic fluid.
