Primality tests (Dubna, Summer 2015):
Lecture 1, Lecture 2, Lecture 3, Lecture 4. (In the fourth lecture a team of videographers appears a little after the 43:00 mark and then sporadically through the rest of the lecture. They filmed me and the students on behalf of one of the sponsors of the summer school.)
Galois theory is a piece of cake.
(I had this made for a student's 21st birthday in my Galois theory class during 2015. Note how nicely the zeta is drawn, frankly better than some students wrote it on the homework.)
An application of advanced math to cooking. Read the label carefully. (Taken from Crisco olive oil spray.)