*Facepalm* It took me all day to figure this out?

First off, I didn't even realize he DID this before he went off in the bag Smurfette was carrying!
Read on readers:

So, the morning I got him home, after releasing the Supreme Class Animated Optimus Prime from his plastic prison; I somehow missed a key feature. I figured out that if I pressed his Autobot symbol on his chest he moves his mouth and talks (says two lines), and if I push him along the floor he will make engine noises, a punching sound effect (with an occasional "ah ha!" afterwards) in one arm, and an axe swinging sound effect in the other, and makes transformation noises when I'm pushing him along the floor and he transforms...

Smurfette & I were on our way back from a friend's house after helping them move (and partaking of their friendly offer of frosty beverages), when the Cub Foods bag Smurfette was carrying started making POLICE SIREN effects!!!! Now, this might not have been a big deal any other time, but it was 2am, a little tipsy, and we live in an apartment building... whoops!

After taking the bag from her (no easy task, as I had the dog's leash in one hand, carrying his kennel with the other), Prime quieted down until we got into our apartment... After getting the dog's kennel set up so he could go to bed, I went back to the kitchen table and pulled Prime out of the plastic grocery bag he'd been carried back home in...

I shit you not, I spent about 3-5 minutes trying to figure out what it was that set off that sound effect... Of course, the simplest solution was the answer, take him in the palm of your hands and squeeze. I felt some give on either side of his head and the sound effect went off again! The buttons were disguised as the horns on the top of his cab! I'm a little ashamed that I didn't figure that out sooner, especially as I thought the lightbar was supposed to light up (as pictured on the back of his box), but when I couldn't figure it out, figured (incorrectly) that Hasbro had just Photoshopped them lit up to make the figure look more impressive...

The annoying thing to me? The Supreme Class Starscream that I keep comparing him to? He had a similar button hidden in his shoulder pylons. You'd have thought that I'd consider that? *Sigh* Kind of makes me wonder what else I might've missed out on in my other figures... XD