One Time Thing
Using fast-food restaurant restrooms as a pit stop during a night out with friends has become common for many people. However, such behavior is more frequently associated with fast-food establishments than other types of businesses. A sign like this in a Burger King restroom suggests the employees may have encountered this situation multiple times.
It appears that the management at Burger King is expressing frustration with individuals who use their restrooms for purposes other than what they are intended for, possibly expecting these individuals to return. However, those responsible for this behavior are more likely to feel embarrassed and not return to the establishment.