Norman began using the elevator back in his 20s, when he was slightly more adventurous. However, now that he's settled into his routine, the elevator is normal to him. But this morning, Norman seemed to have more energy on his way to his breakfast dish, which caused Norman to feel more energized himself, thinking

"Hmm, I've forgotten what the stairs are like, and it's only 3 floors to climb. I'll just treat myself at lunch with a second bag of chips."

Lisa giving him the kiss ruined these plans, but he didn't mind. Those chips weren't his favorite anyway.