Given the huge number of things that all have to go right for a new drug to succeed, Sharer admits to being nervous sometimes.

FORBES: Biotech Behemoth

The election worker behind the computer looked nervous and sometimes scratched his head.

NPR: Kenya Vote Sees Long Lines; Attacks Kill 12

One occupational hazard for instructors: Nervous dogs sometimes have accidents.

WSJ: See Spot Swim: Remedial Lessons Put Pooches in the Pool

Polio (also called poliomyelitis) is highly infectious and affects the nervous system, sometimes resulting in paralysis.

BBC: Polio strain spreads to China from Pakistan

When there's a lot on the line you feel more nervous, but sometimes it's a good thing.

CNN: Fever-hit McIlroy falters in Dubai title bid

He looked stiff, as he always does, and slightly nervous, which he sometimes does.

BBC: Mitt Romney's Olympic mishap

Now, this is something that's very popular if you just say it in isolation, but when you start explaining what is required to make that happen, then sometimes some people get a little nervous.

WHITEHOUSE: President Obama Holds a Town Hall in New Hampshire

Sometimes, I'm more nervous than he is.

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