"I can't recall when Raph was ever not big. Also he would resemble a chelydra serpentina or snapping turtle, whereas I am a trionychidae a.k.a. softshell turtle."

Donatello deflated a bit as he digested that information. "So...we can go home? Why can't we remember things? Alien secrecy? Actually no, that sounds pretty typical- if we actually go off of stereotypical alien encounters and abductions." He made a face at that.