You were in the True Lab, and an Amalgate came out of the sink after you turned all three of them on… The Amalgamate resembled a bunch of heads, with little blobby face-like creatures following it.

Maybe this Amalgamate was the lost memories of Dr. WingDing Gaster, the Royal Scientist who was shattered across time and space. “Come join the fun.” The Memoryhead looked at your cell phone. It was a very mysterious Amalgmate, but it seemed to want to be friends with you. “Don’t worry about it.”