When:
Lookups spiked on January 31, 2013.
Why:
A British man found an unusual rock that turned out to be ambergris.
Or as a headline in the Mirror explained,
Dog walker finds smelly lump of whale vomit on beach that's worth £100,000
Ambergris is "a waxy substance from the sperm whale that is used to make perfumes."
The word derives from the French words meaning "gray amber."