Gee, I Didn't Think It Was All THAT Funny

Scene: Car. Spouse is driving. Kids are in back seat, and haven’t yet started pinching and elbowing and taunting each other (probably because we’re only a block and a half from the driveway).

Daughter Lisa (alias): David* and I look a lot alike.

Spouse: Gee, I wonder why.

Dr. Rachel Beads (alias; not in the best mood): Especially since you’re both adopted.

Spouse laughs at what I’ve just said, to my great surprise.
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*Son David (alias)