I loved that story; in my imagination paleontologist 1 (P1) sees the cartoon and wonders what the official name is. Gets to work and asks old and wise paleontologist 2 (P2) what the official name is.
P2: I don't know. I'll have to ask my venerable colleague (P3) about it next time we are together.
P1: ok cool, I'll just use "Thagomizer" until we find out the official name.
P2: seems reasonable.
a few months pass...
P2: hey P3 what is the official name of the Thagomizer?
P3: um, I have no idea. I should know, I'm a steggy expert, how about we just keep it as Thagomizer!
I wonder how much is embellishment over the years.
If you sawed off your assistants fingers (hard to do with a hand saw); good chance they would also catch gangrene. Far more likely is that at the first sign of a saw hitting your finger, you move it out of the way.
The third person "died of fright", could have been heart attack. So definitely plausible.