Do bubbles in Guinness go down?

Video clip: the whole glass

Clip 1 What can I see in this clip?

This clip was taken without zoom, and at a lower frame rate (125 fps).  The clip is taken at the end of pouring, and you can see waves of dark liquid going in all directions on the lower right hand side of the glass.  On the left hand side, you can start to see waves of liquid go down the inside edge of the glass.  Towards the end of the clip you can start to see the downward motions of the waves of liquid that suggest that the bubbles are going downwards.
AVI (440 kB)
Quicktime MOV (3.1 MB)

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(c) 2004 Alexander & Zare