When the taxonomist has been up too late and maybe had too many beers...
These are excerpts from Funny or Curious Names in Zoology, compiled by Arnold S. Menke of the Systematic Entomology Laboratory, USDA, and the United States National Museum.
Genera
Arfia (Van Valen, 1965) - a doglike, fossil hyaenodont
Batman (Whitley, 1956) - a fish
Bugeranus (Gloger, 1842) - The Wattled Crane, named by an angry man.
Chaos (Linnaeus, 1767) - an amoeba-like protist
Cuttysarkus (Estes, 1964) - a fossil lizard
Disaster (Neumoegen, 1893) - a sea urchin
Dyaria (Gloger, 1842) - a moth
Enema (Hope, 1837) - a scarab beetle (taxonomists need to get out more)
Godzillius (Schram, et al., 1986) - a crustacean
Inyoaster (Pleger, 1936) - a starfish
Mamma (Moersch, 1852) - a mollusk
Ninjemys (Gaffney, 1992) - a fossil turtle. (emys is Greek for "turtle. Ninja is an allusion to the totally rad, awesome, fearsome foursome. Cowabunga, Dude.)
Ochisme (Kiraldy, 1904) - a bug
Oops (Agassiz, 1846) - a an arachnid
Oops (Germar, 1848) - a beetle (described after Agassiz had already proposed the name Oops for his arachnid genus. Oops! Scooped!)
Papa (Reichenbach, 1850) - a bird
Pinocchio (Pagliano and Scaramozzino, 1990) - a braconid wasp (national pride?)
Samba (Friese, 1908) - a bee
This (McAlpine, 1991) - a fly
Townesilitus (Haeselbarth & Loan, 1983) - a braconid wasp
Zappa (Murdy, 1989) - a fish, named after Frank Zappa
Species
Agra sasquatch (Erwin, 1982) - a beetle with large feet. No, really.
Agra vation (Erwin, 1983) - a carabid beetle
Aha ha (Menke, 1977) - an Australian sphecid wasp
Ba humbugi (Solem, 1983) - an entodontoid snail