Piping to fzf

So what are some good aliases that you have setup in your zshrc for using FZF? Let me give you some examples of what I have and maybe you can comment on some of your that might be interesting to others.

Some of these I have found on the internet:

alias gcorb='gco --track $(git branch -r | fzf)'
alias gcob='gco $(git branch | fzf)'
alias gmob='git merge $(git branch | fzf)'

fkill() {
  kill -9 $(ps ax | fzf | awk '{ print $1 }')
}

alias apps='dpkg-query --show | fzf'