Apparently, the ninth drop in the Pitch Drop Experiment is getting ready to fall -- in the 83rd year (or is it the 84th year?) of this long running experiment.
If you want to catch the excitement, check out the live stream.
The Wikipedia entry informs us that "the eighth drop fell on 28 November 2000," and no one has ever witnessed any of the previous drops fall. This Physics Buzz post appeared on Reddit over four days ago, and the drop doesn't seem to be rattled by all the attention.
[Hat tip: Fuch Yeah Fluid Dynamics.]
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Improbable Research has a good write up about this and two other long-term experiments.