If you like this comic from xkcd.com, you are now able to reproduce the conversation in your shell. You only need this makefile:
me a:
@true
sandwich.:
ifeq ($(shell if touch / 2> /dev/null; then id -u; fi),0)
@echo "Okay."
else
@echo "What? Make it yourself."
endif
.PHONY: me a sandwich.
Download the Makefile from my sandwich branch or copy & paste the text above into your preferred editor (you have to convert the spaces to tabs) and save it as Makefile. Then you can run “make me a sandwich.” in your terminal and see what happens.