5. The one with aspirin
“A chemist walks into a pharmacy and says ‘Hey, do you have any acetylsalicylic acid?’ ‘You mean aspirin?’ the pharmacist said. ‘Oh yeah,’ he replied. ‘I can never remember that word.'”

pikselstock/Shutterstock.com
“A chemist walks into a pharmacy and says ‘Hey, do you have any acetylsalicylic acid?’ ‘You mean aspirin?’ the pharmacist said. ‘Oh yeah,’ he replied. ‘I can never remember that word.'”
pikselstock/Shutterstock.com