> My dad claims his sometimes exceeds 200 BPM.

See link below...

> I must admit, I didn't think that was an outrageous number until everybody 
> here started being all like "dude, if it hits 150 BPM you'd nearly be in a 
> coma!"

http://upload.wikimedia.org/wikipedia/commons/a/ad/Exercise_zones.png

If I do a "harcore" cycle ride for an hour or so my average is usually about 
155, which seems inside the 152-171 zone identified by that chart for my 
age.

> That's fine, but it also occasionally does this when I'm sitting in the 
> house too. Why the heck would it do that?

Spurious electrical noise from things switching on/off?

> Last night, I drove to my dance class, and I drove home again. And on both 
> journeys, the monitor went crazy just as I drove past a specific 
> roundabout. I have no idea why, but that seems like one hell of a 
> coincidence...

High voltage electric cables above or below the ground?  Or a train line?

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