[ ... ]
I was pretty good with the hot glass, but the first time I made a medicine dropper in college chem lab, I rolled the lip to go into the squeeze bulb, and held it up to admire, while my right hand rested against my chin. However, I still had the triangular file in that hand, with the tang of the file (used to roll the lip) up, so I branded my cheek with *that*. :-)
Enjoy, DoN.