Let us not forget that English might not be the first language/native tongue of those who made the advertisements that was why there were some errors, and it cant be that funny for me, for me it is quite insulting if we mock them...

Personally, I really love to learn speak Arabic, and honestly I still have very little knowledge about it,but native speakers of Arabic does not make fun of me when i make mistakes, instead, they even help me in a very very courteous way.. Only my two cents ;)