Take a Thin Mint. Nip off a tiny bit of the edge, then turn it 180 degrees and do the same on the other side.
Fill a glass with milk (or a mug with hot chocolate). Whatever you do, don’t use a cup of coffee spiked with Bailey’s.
Dip one nipped edge of the cookie into the milk, place your lips on the other side and suck as you would a straw.
Thin Mints are porous, and the chocolate coating is airtight. The liquid will rise through the cookie.
Eat the cookie, which has now been “dipped in milk” (or cocoa, or whatever)* from the inside*.
Evil, I tell you. Evil.