I've got two more to add to the list, here they are:
Where's the cocaine?
Translation: Where's the Kokanee?
Commentary: Kokanee is a popular Canadian beer brewed in British Columbia. One of my Italian friends literally asked for crack at the liquor store, meaning to say the name of the beer of course.
Translation: Fist bump/"pound it"/knuckles (depending if you're British/Canadian/Australian it seems).
Commentary: The most innocent mistake, obviously said by a girl when asking a dude to 'fist bump'. Of course we spent the remainder of the evening asking people to fist.
If you haven't seen the original post, here it is: Sh*t My Italian Friends Say