Other variations include 'last thing I'd do', 'last thing I'm going to do', 'last thing I'd ever do', or a combination such as 'last thing I'd ever want to do'.
If you see a phrase that includes 'ever' with 'do' that usually holds the meaning of 'I dont want to do this thing', while the other above examples without 'ever' could also mean 'I will do this thing, but last'.