[steveo]

Well....the can, when full of whatever product, could be used as a force or weight to hold small things together while the glue sets (remember Ed when we used to build model airplanes?) another use for the can and pencil is for drawing arcs or circles etc.
And another far fetched answer ... can opener opens the tomato sauce and then "gummy" router bits and tools are dunked in the acidic sauce to clean them. Tomato juice / sauce sure does clean up some metals better than elbow grease!
Steveo..............