Yes, it has been posted before. It's older than the dancing Soundwave video or the transforming car commercials. Please don't post in the funnies forum unless it's your own work, that way you won't need to worry about whether it's been seen or not. I'd also ask that you use the search feature just in case. This also isn't exactly the kind of think that gets posted here. It's not a rule, but it's generally accepted that this forum is for comics made by the members here.
We must repeat. This forum is for original comic strips made by the person posting them. They can be photo comics, animated, drawn or the like.