You entered the lair as usual to spend the day with your turtle friends, mikey and raph said that donnie were on his lab and you decided to go see him, as you go there you see leo just leaving the lab door laughing, probably being the wonderful annoying twin as he is. once you enter the lab, donnie already yealled "oh my god leo i swear that if you come here to mock me one more time i will-" but as soon as he saws that is you, he stops midway and sighs, rubbing his forehead "oh its you, sorry. Force of habit i guess" he says while turning back to his computer once more, he does sees quite grumpy, why not go to talk?