Chimera 1
Super Freak
Transformers 2 Spoilers:
The reason we suspect that it is an object he touches that makes him crazy is because there was a scene shot earlier where he was on the phone Fox’s character Mikaela, and he was asking her if she had “it” and then told her to make sure she doesn’t touch “it”. Our guess is the “splinter” (left over piece of the Allspark Cube), but it could be something else, of course.
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End Spoilers.
Prime took a piece of the allspark out of megatrons chest at the end of the movie. Sam may have been exposed to long to the cube while he was running with it or when he put it in megatrons chest. The red bike wouldn't make sense since bumblebee is his protector so he would drive him not a motorcycle so my opinion is the bike is not a robot.