Sheldon: "I'm not crazy; my mother had me tested." - Season 2, Episode 15
Howard: "I'm not saying my mother is a controlling neurotic, but when I told her I was going to be an astronaut, she asked if I had considered being a lawyer instead." - Season 1, Episode 5
Leonard: "I've been thinking about branching out into journalism. I've already got my own blog. It's just a diary, but I like to think of it as a prequel to Twitter." - Season 3, Episode 3
Penny: "I'm a Sagittarius, which probably tells you way more than you need to know." - Season 2, Episode 1
Raj: "I'm going to be in People magazine!" Leonard: "You're not going to be in People magazine." Raj: "Then why did I wax my everything?" - Season 1, Episode 4
Amy: "I excel at many things, but getting over you wasn't one of them." - Season 8, Episode 24