When you or someone else makes a claim of doing
something that they clearly think is
cool or clever and deserving of praise, but did so out-of-the-blue when nobody asked and it isn't really that
cool or clever, then the appropriate response is to ask them 'if they want a cookie?' as a just reward for their deed.
Rwo friends watching a murder mystery
show:
Claimant: I totally knew he was the
killer like 20 mins ago..
Responder: Do you want a cookie?