What was the name of the Mac (68000) assembler?

Question

I'm sure there were several, but the one I was thinking of would display a nice text screen when you crashed the computer thoroughly.

The Text was "Well smoke me a kipper."

Answer 1

The name of the assembler was Fantasm.

Answer 2

No one else has answered this, so I'll answer the part I can: the original Macintosh debugger was MacsBug.

So far as the kipper quote goes, the only thing that comes to mind is the Pathogen computer virus.