I was showing one coworker some pictures of my family on Flickr, and another co-worker jumped in ...

"So that's your sister?"
"Yep, that is."
"She's hot. You should set her up with [another coworker]!"
"Yeah, not so much."
"Why not?"
"Erm, because she's dead..."
"... ohhhhh ..."

Yeah, that wasn't awkward. Not at all.