Dear DreamWorks Animation,
If you want to have a special cameo in one of your films (at this particular point it's Puss in Boots), you need to have someone with a distinctive voice. That’s the point of a cameo - a recognizable person gets in, gets out and BOOM, they're done. They were there before you even knew it and left before you got the chance to say hello. This is especially critical when said person is only doing voice work; the more distinctive the voice, the better.
So why are you giving Guillermo Del Toro a cameo? Do you expect people to go “Hey, that sounds like the director of Pan’s Labyrinth and Hellboy! Why, I do believe that is him!” Granted, he has done voice work before. I’m sure everyone remembers where they were when they heard the voice of the Newsreader in Diary of the Dead. Sheesh (Realistically, I'm sure the fact that he's an executive producer on all of your future films has something to do with it).
Next time you have a spot for a cameo, get someone with an actual voice. Like that homeless guy with the golden voice. I’m sure he’s not up to anything.
Someone who is about deaf anyway.