[ian murphy business train]

simply put, I'm not a Chemistry wizard but I am very curious. I poured myself a glass of wine this evening and saw something I've never seen before. A drop fell back into the bottle and hovered on the surface for a few seconds. My first guess was some sort of oil from the rim of the bottle but I could not understand how a drop falling several inches back into the bottle could have enough resistance to stay afloat. I'm puzzled!

[Borek]

Happens. I have seen it many times. For some liquids it happens more often, for some it happens quite rarely, definitely it depends on the surface tension, probably also on the viscosity.

[Arkcon]

If you're even a novice oenophile, you're aware of a wine having "legs" the curious viscosity allowing wine to cling to the side of the glass in streams.  This is caused by the viscosity of alcohol and glycerol in the wine.  So its not too surprising that the droplet survived striking the surface for a few seconds.

[swintarka]

You probably saw an anti-bubble:
http://en.wikipedia.org/wiki/Antibubble