[quote=@NarcissisticPotato]
[quote=@Agent B52]
Marcus might, if the arm somehow ends up in or near his garage without him noticing. He would assume it was something he constructed while drunk. When he's hammered he tends to go full on mad scientist and he doesn't always remember what he's built, or why, or how.
[/quote]

Sounds like a plan! Expect total vengeance, Moderation!
[/quote]

Just for the record, simply telling Marcus "Have you seen my arm anywhere?" would lead to a mostly peaceful solution. However "Hey you, gimme that arm!" will lead to "Build your own. This one is mine."