Lily was in the garden, with Harry (He was just a baby) when James came in and said "I just got a note from Sirus, he says Voldemort is coming so we have to get out!"
"Come on Harry darling we have to go!" said Lily worriedly. Harry started to cry and when Lily told him to shush, he howled harder, then there was big flash and Lily and James apparated. Now they had made clones of themselves and Harry, (another copy of yourself.) but as they apparated they realised they had left the real Harry with the clones of themselves and taken the clone Harry with them!