Physics students experiencing the curriculum progression in real-time. First year: "Woo! F=ma! Things move when you push them!" Third year: "Maxwell's equations have consumed my soul and the vector calculus is speaking to me in my dreams."
The transition from happy-go-lucky Newtonian mechanics to the existential crisis of electromagnetism is the academic equivalent of going from a party to a war zone. Not pictured: the quantum mechanics student, who has transcended physical form entirely.