Using ggplot2, can I insert a break in the axis?

Question

I want to make a bar plot where one of the values is much bigger than all other values. Is there a way of having a discontinuous y-axis? My data is as follows:

Answer 1

Not with ggplot, but with plotrix you can easily do that:

library(plotrix)
gap.barplot(df$a, gap=c(5,495),horiz=T)