Answer the phone like this:
*Ring*
Me: Hey!
Other Guy: Hey, what's up?
M: Listen, I don't have long, the guy who's holding me just left to attend to someone else, I don't know where I'm being held, but you need to help me. I want you to have the Police trace my signal.
OG: Lolwut?
M: *Sigh* Listen. What's your name?
OG: Dude, it's me, stop playin'.
M: Tell me your name!
OG: Dude, it's Devon.
M: Alright, Devon. You ever heard of the SSOA?
OG: The what?
M: The SSOA, it's a spy agency. Listen, I need you to call *insert random phone number here* and tell them that *insert code name here* has been captured and is preparing to terminate the operation. Can you do that for me?
OG: Sure I gue-
M: SHIT! He found me. I gotta go right no- *hang up*
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I have a pretty dry sense of humor in real life, so I can usually do that without cracking a laugh...
It works well to confuse the fuck out of your friends.