I have a new group of Grade 8's in metalwork for the last term. One kid speaks no English, only Spanish.
My Spanish is limited to mostly the naughty words.
So, I ran my basic safety powerpoint through Google Translate (and back again a couple times to make sure it kept its meaning), and added the Spanish. He appreciated that, and it seemed to make sense to him. Today, I demo'd the machines.
At the milling machine, I said "This one is for Juan: 'no pongas los dedos donde no pondrías tu pene'." I then motioned "Shhhhhhhh!" and zippered my lips.
Juan laughed and laughed. The other kids asked him what I said, but he doesn't know the English. Good times.