When I learned to walk, my parents decided to put up a barrier at the foot of the stairs so I wouldn't go up them and fall down. I found this hideous. To be fair, they were probably pretty wise in doing this, since before I was 10 I had fallen down the stairs 2 or 3 times (without breaking anything or sustaining brain damage.. or at least that's what they tell me).
The first day, I glared at the barrier whenever I saw it.
The second day, I went up to it and gazed up the stairs longingly.
The third day, I tore it down in a rage and triumphantly ascended the stairs, shouting "up! Up! UP!" at the top of my lungs.