Joking in the Knifemaker's Shop

Because metalworking moves along in stages, there are moments of relaxed levity, Three jokes or riddles passed around:

The knifemaker asks What do you call instant mashed potatoes?  The answer, Imitators!

The knifemaker's lady friend asks What do you call a cow without legs?  The answer, Ground Beef!

The knifemaker's aunt tells A couple friends walk into a bar. Luckily the 3rd one ducked.

Source: wifflegif.com