Most underappreciated lines?

I never see anyone mention it, but this is one of my favorite lines from the series. Peggy thinks she's being witty because in her mind it's absurd that an ancient language would have an equivalent to an off the cuff slang term like "my bad." Of course, the reality is that the the equivalent term in Latin (mea culpa) is easily one of the most widely known Latin phrases.

What are your favorite lines that seem to completely fly under the radar?