Carrie's bell. Two brains gave it to her bc he could never hear her nearby. So he figured he'd be able to hear her if she had a bell (since bells makes noises)
I think i told Either @ninjastormhawkkat. Or @liloskull343. Something along those lines
Two brains would probably make something up like its a gift. (Kinda is but also really for his peace of mind and keeping his heart rate normal) and Carrie accepts it bc she's just used to weird gifts given by him. Really cant understand why he doesnt like her gifts as much.
It would be pretty funny if as soon as he does this. That day happens to be some whacky holiday with bells. Everyone wears and rings bells which would drive him crazy. (Oo rp ideaaaa-) he tells carrie to get rid her bell but she likes it and doesnt want to stop wearing hers. (Really loves collecting trinkets)
Funfact: even when she's not intentional sneaking up on someone, she is pretty quiet. Hence why in the rp i was doing with @chaoticerisstuff she was able to get near joe without him noticing.