Madam Zirinka: Bad like an Irwin Allen movie.
There's a bit of a double entendre here. Irwin Allen was a producer/director renowned for making some of the most popular TV series of the 60s and 70s (and beyond) and the first big disaster movies, such as The Poseidon Adventure and The Towering Inferno . Mme Zirinka is referring to the fact that events that might ensue from these two girls coming together will be catastrophic, like the events in an Allen movie, but in the word 'bad' there's also a gentle nod to the fact that Allen's movies, many of which were not only popular, but also successful, were not always great critical hits, and some of his films, such as The Swarm and Return to the Poseidon Adventure are considered by some to be amongst the worst disaster movies ever made and were box office bombs. Allen died in 1991, aged 75.