Vodka is best. It has absolutely no flavor when it's in your mouth as long as it costs >$20 per fifth. It burns after, but if you're a pusillanimous individual you just chase it immediately and then the flavor of your chaser masks the burning.
Whiskey, especially Jack Daniels, tastes like starfish. I took a sip of my friend's 50/50 jack/coke and literally puked. Not a lot, but still puked. After 10 minutes went by and I felt good again, I chugged 5 shots of vodka straight. Never even gagged.