Weird densityplot behaviour

When I do: 
rx<-rnorm(500)
densityplot(rx)

I get something that looks reasonable.

However, when I do:
rx<-rnorm(5)
densityplot(rx)

I get strange results sometimes...
For example, if rx = c(1,1,1,1,2), then the resulting plot shows marginal 
densities greater than 1.  

And why exactly is that strange ? For instance, try calculating the 
normal(0, .3^2) density at 0 [ dnorm(0, mean = 0, sd = .3) ].

I must be overlooking something.

Thanks.
geoff

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