Marvin the Martian says, “Where’s the kaboom? There was supposed to be an earth-shattering kaboom!”
The line captures Marvin’s recurring frustration when one of his elaborate plans to destroy Earth fails. Although he is a Martian supervillain, Marvin is usually portrayed as soft-spoken, polite, and mildly bewildered rather than openly furious. That contrast makes the sudden complaint especially funny.
Marvin first appeared in the 1948 Bugs Bunny short “Haredevil Hare,” where he was an unnamed Martian antagonist. His best-known weapon is the Illudium Q-36 Explosive Space Modulator, which he uses in attempts to eliminate Earth because, in his words, the planet obstructs his view of Venus.
The quoted line is strongly associated with “Hare-Way to the Stars,” a 1958 short featuring Bugs Bunny and Marvin. K-9, Marvin’s dog-like companion, often appears alongside him, but K-9 does not deliver this signature complaint. Wile E. Coyote and Gossamer are unrelated Looney Tunes characters.