Usually students are fooled by their seniors and other students on the first day of school but this guy in the video above fooled an entire class by acting as their Chemistry professor.
His body language was spot on and he actually did look like a professor.
The students were listening to whatever he was saying very carefully until the real professor himself interrupted and asked who that guy was. Even he was pretty supportive. You can see him telling in the end that nobody else but he is Dr. H who is their Chemistry professor.
Check out the awesome video above.