Devious Amoeba
Someone who is very sneaky. A devious amoeba has the ability to cause trouble without making his/her involvement known.
Person 1: "Did you hear about Andrea and Mikey?"
Person 2: "Yeah. I can't believe they broke up."
Person 1: "Something seems fishy. I think there might be a devious amoeba involved here."
Person 2: "Yeah. I can't believe they broke up."
Person 1: "Something seems fishy. I think there might be a devious amoeba involved here."