sample session with a bash shell expansion named “history expansion”

$! 1
bash: 1: command not found
$!1
bash: !1: event not found
$!+1
bash: !+1: event not found
$!-1
! 1
bash: 1: command not found
$!!
! 1
bash: 1: command not found
$!-0
bash: !-0: event not found
$

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