Karen must be from the opposite side of the family than Mary Grace, Thelma Lou's "other" cousin - who Barney "affectionately" calls a dog!
Barney: Well, what happened after you had the coffee?
Andy: We got married.
Barney: Oh, good, I knew you two'd hit … Got married!? Aw, come on, Andy. Boy, you're funny, you are. You oughta go on the radio and be an all-night disc jockey. At least then I could turn ya off.
Pay close attention - this episode is one of the very few times we see Andy actually shooting a firearm.