If I am in the right frame of mind (eg. being called during dinner), I will sometimes ask how I get rid of the blood stains in the carpet now that the body has been disposed of. Quite often they don’t hang up right away. More like stunned silence.
When they start telling me about their ED meds, I tell them how I love those, and how they work. In great detail.
The longest that’s gone on is about 20 seconds.