The differences between the coaldrawing faceandnon-coaldrawing facearelowstowingfactorin the goaf, vigorousmovementof roof, and high stresspeakabutment pressure alongthe strike.
Certain idiotic-sounding behaviors that create a bond: drawing a smiley face on a check, doling out after-dinner candy, wearing a funny necktie or forecasting good weather.