I think the handwriting or font used for 'Soup of the Day' and "The tears of our enemies' both work really well. The soup font is flowy and has good depth while the tears font is just very blunt and more harsh. Together, they are fantastic.
If you have friends you will never be short of prank ideas. There might be funny pranks as well as scary pranks but importantly they need to qualify as good pranks. This page gives you an idea of funny April fools prank.