That '70s Show 1x21

Water Tower

The guys paint a pot leaf on the water tower and Kelso falls off trying to fix it because everyone thinks it looks like the finger. Instead of going to the hospital they go to Eric’s cause his mom’s a nurse. When Eric goes to get her he walks in on his parents having sex. Having trouble sleeping and not being able to look his parents in the eyes leads his parents to believe he’s on drugs.