Fill 3/4 with ice in a very small glass, a rocks glass, or -what I use- those small clear plastic cups. Add equal amounts of Kahlua and vanilla vodka -- almost filling the glass (i just wrote 3 oz cause the recipe wouldnt publish without quantity but just make sure they are equal amounts).Top with a splash of club soda.
Add the straw, count to 3, and sip as hard/fast as u can through the straw! Make a few more and soon your mind will be erased! hahaha ;).