It was startling this past week to see many of the hottest stocks stagger around and then fall down like drunken sailors in a dodgy street.This is April, after all, and April has been one of the top months for investors since 1950.But stagger stocks did. The Standard & Poor's 500 Index finished below 5,000 for the first time since Feb. 21. The Nasdaq Composite dropped 5.5%.