School. Math lesson. The teacher asks:
– Vovochka, imagine that dad gave you 400 rubles, and you gave 100 rubles to Mashenka, 100 rubles to Lenochka and 100 rubles to Svetochka. What will you have left?
– Mashenka, Lenochka and Svetochka… Then gonorrhea, syphilis and chlamydia.