Are you sitting down to read this? If not, then we suggest you have something to fall back on when you peruse this list, because some of the actors shown here have some very real potential to make you expel air from your lungs at an alarming rate through laughter. We're exaggerating ever-so-slightly of course, but some of these entries are so unbelievable, you're likely to think that this article is one of total fantasy rather than truth. We can't say we can blame you either, considering some of the absolutely outlandish entries on this list. Did you know that Vin Diesel voiced a giant robot before he became famous? How about the revelation that one of the most legendary actors ever voiced an... erm, giant robot? No, this isn't a list about actors that voiced Transformers (great idea though), but it is one that will make you want to go back and watch each example listed here to see if you can recognise the famous voice that you never managed to put a name to before. You owe it to yourself to make it to the final entry too. There's a very special surprise waiting for you. Believe us when we say that it's totally worth it.