It's always fun to spook people, supernatural or otherwise. Cooper's jumpy reaction is noted, as is the fact that he can hear her without too much effort on Aradia's part, since it's handy to keep track of who can see her in a pinch - but he seems to know at least a little bit about what's going on. Interesting.

"There's a family curse?" Out of courtesy, she puts in the extra focus to become visible. It might help keep the conversation going longer. "I've heard rumours about it, but they're pretty unreliable. Most of it's just people trying to make themselves sound fancier then everyone else."