Liz says "we don't know" without getting slimed.
As usual for the series, Lisa gets slimed when she says "I don't know" while introducing the episode with Christine. But earlier in the scene, the show failed to slime Christine when she said, "I don't know why I say that."
Alasdair said he got "water" dumped on him while delivering newspapers, but he didn't get water dumped on him at the time he said that.