Although not common, some people exhibit allergic reactions to some strange and hard-to-avoid things, like heat, cold, sunlight, sweat, and vibrations. Vibrations?

Once again it is the body having a strange reaction to what should be ordinary stimuli, as histamines are released in response to the sufferer's body being treated like one of 007's martinis. Hives, weals and welts erupt after as little as five minutes exposure to any kind of vibration.

Treatments for these odd allergies include antihistamines, desensitization, and avoidance. Link -via Digg