He's not like anybody I've ever met. He's like a riddle wrapped in an enigma wrapped in a vest.

Related:

• Milhouse: You like Nelson?! But he's a creep and he chipped one of my permanent teeth!
  Lisa: But I bet underneath he's a sweet, sensitive...
• Milhouse: Hi, Lisa. Could I talk to you, or would that just make Nelson whale on me again?
  Lisa: Don't worry. Nelson and I don't like each other...
• Marge: When I first met your father, he was loud, crude and piggish.
  But I worked hard on him, and now, he's a whole new...
• Bart: Hey, Lis, Mom said you had the toenail clippers and.
  Woah! Lisa, look out! Nelson's in our house...
• Lisa: Nelson! Um... that note Milhouse gave you? It wasn't from him.
  It was from... me. Nelson: You?! Why would _you_ like...
• Lisa: Isn't it nice up here? What are you thinking,
  Nelson? Nelson: Am I thinking about what? Lisa: About...
• Nelson: Check it out. Skinner's mopping the goo off his house!
  Wait till he finds what I left in his birdbath...
• Skinner: [gasps] A principal's ransom in stolen goods!
  Well, sir, who's "Ha-ha"-ing now? Nelson...
• Lisa: Milhouse, I'm so sorry! Paramedic: He can't hear you now.
  We had to pack his ears with gauze. -- "Lisa's Date...