[He raises an eyebrow, easily deducing what the text has been about given their recent conversations.]

I hope she hasn't brought the ambulance too close to the funeral, we don't want to alarm anyone.

[Also, he's so not getting into it.]

I suspect, though cliche, that the most logical place for any kind of explosive would be in the coffin itself. John is sure to be in the front row, as her remaining family, and thus in perfect position for it.