Question

all of the following are examples of safe laboratory/shop behavior, except:
walking the laboratory/shop
talking to someone while they are using equipment
obeying laboratory/shop rules
using a fire extinguisher for fires only

Explanation:

Walking in the lab/shop, obeying rules, and using fire - extinguishers properly are safe behaviors. Talking to someone while they are using equipment can distract them and cause accidents.

Answer:

Talking to someone while they are using equipment