A/N: Inspiration struck. This is with normal Snape.
"What, in the world?" cried Madame Pompfry.
"He's gone nuts," explained Sirius.
"He doesn't remember that we're his friends," explained James.
"Tried to hex us," added Remus.
"I don't think, I'd blame him," answered Madame Pompfry, "From what I can see looks like you hexed him yourselves."
"It was the only way to get him down here!" cried Remus in defense.
"First let's unbind him," ordered Pompfry, to which Sirius complied.
"I want to see Professor Dumbledore, immediately!" cried Snape "Potter your pranks have gone far enough!"
"Batty, I've never pulled a prank on you before, Moony has, he's pulled at least one on all of us."
"Don't play innocent with me!"
"Batty," started Sirius.
"Don't call me that! I want to see Professor Dumbledore immediately!"
"You will be able to see him in a minute, let me first check you over," calmly answered Madame Pompfry.
"I am not sick, I am perfectly fine! Could you please get me Professor Dumbledore?"
"Now, now, what's all this about?" asked Dumbledore entering the room.
All four boys started in on their own accounts but Dumbledore stopped them by holding up his hands. "Severus, you tell me what happened."
Snape went into his whole account, to which Dumbledore nodded in thought every now and then. When Snape finished Dumbledore asked, "Now did you feel any wooziness before these 'strange things' occurred?"
"I think I did," answered Snape now a bit calmer.
"It sounds to me that you have experienced a shift in realities," answered Dumbledore.
"Professor, I thought that those were purely theoretical," spoke up James.
"There has been no recorded proof just peculiar occurrences that point toward it, and I think that we have a live case here."
"Is there anything that we can do?" asked Madame Pompfry.
"With cases being so rare I highly doubt it, all young Severus here can do is go on with life and hope that he is returned to his reality."
"Professor, what about the Snape of our reality?" asked Sirius.
"When the next reality shift occurs if it occurs either we will get yet another version of Severus or the one of our reality will return. Hopefully it will be the latter."
"I'd say!" agreed Remus.