Mountain Dew does taste like nothing sometimes. It's really weird. If I drink it when I get up early in the morning, I can't taste it. If I eat any kind of sugary snack and I drink MD right afterwards, I can't taste it either.
Yeah. Even when I'm wide awake and after the first few gulps of a 1 liter, I can't taste anything after that.
Some times when I wake up I can't taste a lot of stuff either, Vault tastes awful right when I wake up, but I drink it anyway.