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NEW YORK ( TheStreet) -- Just because stocks were expensive five years ago doesn't mean they're expensive today. Jim Cramer told "Mad Money" viewers Tuesday that bears believe that as the markets approach their all-time highs of five years ago, bad things could happen all over again. Cramer said it's prudent to be cautious if you're a parent, for example, because there's no downside for warning your kids too many times about drinking and driving or hanging out with the wrong crowd. But investing is different, he said, because being too cautious can cost you a lot money. Shares of Apple ( AAPL), a stock Cramer owns for his charitable trust,