And some from Mass Effect 2:
Shepard: "It's been a couple of years since I passed through here. Security seems to have tightened a bit."
C-Sec Customs: "After the Geth attack, there was a review of security protocol. A few minor changes were made to reduce the risk of Geth infiltration. We apologize for the inconvenience."
Legion: "Geth do not infiltrate."
C-Sec Customs: "You should leave your personal synthetic assistant at home. They're not allowed on public shuttles anymore."
Legion: "Geth do not intentionally infiltrate."
Turian Arms Dealer: "Next time you go out in the Terminus systems, bring me back a Geth head to use as a table lamp."
Legion: "That functionality is not available."
Shepard: "Have you got a minute to talk?"
Mordin: "Actually, wanted to talk. Medical matters. Aware that mission is dangerous, different species react differently to stress. Aware you come by a great deal. Have had other species become attracted to me before. Awkward. Not interested."
Shepard: "You've had members of another species make a pass at you?"
Mordin: "Constantly. Very awkward. Skin tone apparently attractive by turian standards. Subset of krogan sexual deviants enjoy salarian flexibility. More cartilage in skeletal structure. Asari offers intriguing, actually. Wonder why. Transspecies pheremones unlikely to work. Must be neurochemical."
Shepard: "Wait a minute Mordin, you're just yanking me around, aren't you?"
Mordin: "Shocking suggestion! Doctor-patient confidentiality a sacred trust. Would never dream of mockery. Enjoy yourself while possible Shepard. Will be here studying cell reproduction. Much simpler. Less alcohol and mood music required."
Legion: "We do not comprehend the organic fascination of self-poisoning, auditory damage and sexually transmitted disease."
Mordin: ""No testing on species capable of calculus. Simple rule. Never broke it.""
Shepard: "Do you ever pause for a break?"
Mordin: "Sorry, I'll...try...to...slow...down....no, no no no, can't do it."
Shepard: "Have a minute to talk?"
Mordin:
-"Perhaps later. Trying to determine how scale itch got onto Normandy, sexually transmitted disease only carried by varren. Implications... unpleasant."
-"Not now, I think I just developed a cure for Joker's illness! No, wait, causes liver failure, never mind..."