Step brother bothering me about missing dart board dart.

So he is sitting here at this moment reading what i'm typing and was bugging the crap out of me because he thinks i have his dart board dart which i do not but it WAS fun to screw with him into thinking i do have it, but now it's becoming old and he doesn't realize it's most likely in his room sitting wherever it landed after it bounced off the wall. Now he says he is going to comment on this and call me a liar, now he said whatever. but he doesn't know i do indeed have the dart.