Cyborg-
One word - Tofu
Steal all his meat
Make him Tofu for breakfast
Tell him the only thing left to eat in the world is Tofu
Ask him if he still likes Jinx
Tell him Beast Boy beat his high score
Take the T-car for a 'test-drive'
Borrow the battery and other miscellaneous parts in the T-car
Tell him Atlas is stronger than him
Ask him if the metal detector goes off in the airport security when he walks through it
Ask him how he goes to the washroom
Tell him Beast Boy is driving the T-car
Tell him Beast Boy broke the T-car
Cover the T-car in mud and dirt
Steal the keys to the T-car
Tell him he's the worst at video games
Hold a magnet up to his head and see what happens
Purposely use a magnetized metal detector around him
Tell him you got in a car crash. Describe the car you wrecked exactly like how the T-car looks and say you just managed to drag it home in five different pieces. Watch him run off to check on his car
Ask him if the T-car is his baby, who's the mother?
Tell him Gizmo is smarter than him
Redecorate the inside of the T-car
Paint the T-car lime green or hot pink, or some other crazy color
Ask him if his 'jewels' survived his accident
For the question above – if so, did he get a replacement? O.o
Ask him if he's male or female or no gender
Ask him if he has access to Wi-Fi through his arm