Warner-Lambert and Listerine
Pfizer acquired Warner-Lambert to get Lipitor, but as wikipedia points out: [Listerine] is currently manufactured and distributed by Johnson and Johnson since that company's acquisition of Pfizer's consumer healthcare division in late December of 2006.
Pfizer closed down the Warner-Lambert Ann Arbor research facility. One of the developers of Lipitor was terminated.
Also on Jeopardy, a respondent on Chex cereals answered Ralston-Purina instead of General Mills.