"Let's try that posture again so we can see how you can avoid hurting your neck." This is the best answer, because this is this the nicest way for Randall to inform his friend of his bad posture without discouraging the friend.
It is classed as a depressant, meaning that it slows down vital functions-resulting in slurred speech, unsteady movement, disturbed perceptions and an inability to react quickly.
4. Short-term
Slurred speech
Drowsiness
Vomiting
Diarrhea
Upset stomach
5. Long-term
Unintentional injuries such as car crash, falls, burns, drowning
Intentional injuries such as firearm injuries, sexual assault, domestic violence
Increased on-the-job injuries and loss of productivity
Increased family problems, broken relationships
High blood pressure, stroke, and other heart-related diseases