I know that groan. It the sound my better half makes when I say things like:
"I found this really cool online store"
"I could build a really cool XYZ!"
"Check out the grain on this timber I found on my sales trip!"
"Can you believe they've started a brewery there?!"
"No, we don't have to be in the moshpit, but...."
"I can probably get it up to 450rwkW without spending too much more..."