Nervous?

Tyler was looking through a Thomas the Train book, which had Cranky the Crane shown on one page. The crane was holding a net full of watermelons and had a worried look on its face. I asked Tyler what was wrong with Cranky the Crane. Tyler replied, "He's nervous."
"Nervous? What is he nervous about?" I ask, thinking that Tyler must not really know what the word nervous means.
"He might drop the watermelons."
Crap! Okay, so maybe my 2-year-old knows what the word nervous means, after all!