Okey dokey, here is a chart of the 5066 VFINX daily closings since March 27, 1987 with markers for days when it changed by 3% or more. The green line is +1 for days when VFINX gained 3% or more (69 of them), -1 when it lost 3% or more (also 69), and zero elsewhere.
The long quiet spells are clear, as are the volatile periods around the 1987, 2001, and 2008 crashes. It is also clear that the market has been really volatile lately.
Lest you be tempted to use simple statistical analysis, here is the distribution of the percent daily change charted in 1/2 sigma bins along with a Gaussian distribution of the same mean and standard deviation.
VFINX dist 1.gif
Here they are on a log scale. The "fat tails" are clear.