I am thinking honey, but my instinct tells me if should be the same answer, not matter what the viscosity.
If your are pouring honey from a long necked bottle, what is the fastest way to pour it? Just put the bottle upside down and have an interrupted stream while the bubbles go up the neck? Or tip it so there is a gap on top of the pouring liquid and you get a constant stream coming out?
Feel free to pepper the answer with explanations of all the physical phenomena involved.