11th grade, Chemistry class. We were working with acids and bases and doing a few experiments. One of the students turned around suddenly while our teacher was looking over their work. The student was holding a beaker of acid in his hand and as he turned around to talk to our teacher he splashed it all over his shirt and pants and also the teacher's shirt and pants. The teacher got naked in a second, but the student sort of froze. The teacher in one quick motioned ripped the shirt and pants of the student. We had an emergency shower in the room and both, naked, jumped into the shower. I have been in sports all my life so seeing someone my age naked was not a first, but this was the first time I saw an older man naked. Our teacher was in his early 40s and after seeing him naked could tell that the guy worked out. Man I love chemistry.