An incredibly fast (especially when using two disk drives) disk copying program for the Apple ][ series of computers. The program could copy a Apple disk in maybe forty seconds tops.

Disk Muncher could be seen running many times during every lunch hour in our computer lab. Copy progress was shown by a series of periods [.] running vertically down the screen. In four passes the disk was copied.

Of course, if the program had trouble copying a certain disk, the disk drive would make that horrible physical grunt of pain:

"UNGGH!... UNGGH!..."
Upon hearing these sounds, one would know that the disk needed something perhaps a bit stonger like Copy ][+.