[The following is in reference to conditions upon merchant vessels in the 17th century.]
The captain of one Danish East Indiaman was so maddened by the plague of scuttling vermin on board his ship that he offered his sailors a tot of brandy for every thousand cockroaches they killed. Within days, the crushed bodies of 38,250 insects had been presented for his inspection.
Source:
Dash, Mike. “The Tavern of the Ocean.” Batavia's Graveyard. Three Rivers Press, 2003. 105. Print.
Seems like a lot of work for a shot of booze.