I call it "The Lazy Jon"*. One shot regular milk. One shot chocolate milk. Instructions: shoot back the chocolate, then the regular. Repeat as necessary.
*It's called this because I am, in fact, lazy. All of the cups and glasses in my apartment were dirty except for two shot glasses that I found in a cupboard. Rather than clean a glass and be a normal and fully functional member of society, I decided to utilize the two shot glasses instead. And thus, The Lazy Jon was born out of necessity. As the saying goes, "necessity is the mother of invention".