TV vs LIFE
I was watching TV, I opened the channel but that channel had a program I didn't like so I switched to another channel.
Now think that TV is your life, channels are thoughts, programs are memories/occasions. So, if you don't want to watch a channel that you don't like, then why are you thinking about a thought that hurts you.
Hence, take the remote and switch to the thought that gives you happiness and success.
Remember that Switching from one thought to another is as simple as switching from one channel to another in a TV.