Vim "show my last command" command?

Is there a command which shows what was the last command in normal mode?

Suppose I accidently hit random key and got some unexpected result. Sure I can undo it, but could I reveal what key was pressed and how it was interpreted?

Hit the colon (:) and then use the up arrow to start going back through previous commands. You can use the up/down arrows too to move around the list.

q: will show you command history in Vim.
q/ will show you history of searches.
And must importantly, :q will quite the mode.

The text from the last command is stored in the . register. You can see all registers by :display. Unfortunately it doesn't say what the started the normal command.

To see commands from : (command mode) you can use :hist or q: which is limited to the last 20 (by default).

Another ability is to save the undo buffer :wundo undo.bin -- but the undo buffer is binary.

But none of these actually answer your question. I'm curious if it can be done.

Entering colon : then ctrl+p shows your previous command, i.e., moving backward through your vim command history. ctrl+n moves forward.

This is very convenient if you're used to using the command line and prefer not to change your keyboard hand positioning to use arrow keys.