Well, screaming was definitely a way to get Sayaka's attention. She was quite a bit confused, to say the least. But waking up naked and covered in goop was enough to do that rather easily.

But the scream. Scream was different, scream meant trouble, and before Sayaka even knew what she was doing, she already had her Soul Gem out was about to transform when she realized a very important fact.

The person doing the scream was right next to her, naked and covered in goop as well, but that VOICE was

"... Mami-san?"