Why use an OTP if you already have a secure channel Let's say I have some sensitive information, and I want to encrypt it with a OTP and send it to the FBI or something. Now, in order for the recipient to successfully decrypt the message, he needs to know the OTP key as well. But, you don't just send the key as plain text to the recipient, this is fairly obvious since an adversary can obtain it with ease. So then what? You use a secure communication channel to share the key. This is where my brains stop working. Why share the key of a OTP through a secure channel, and not just share the sensitive information itself through that secure channel?
First, let's re-iterate that there is no true one-time pad in modern cryptography or any other information system - it's only a hypothetical thinking reference. 

The reason to use OTP in this case, would be to maximize the utility of the rare window where there would be a secure channel. 

Let's imagine a world without internet and public-key cryptography cannot be carried out efficiently by any instrument available to the people and the enemy, the secure channel is a scarce resource, so a huge OTP stream is exchanged here so that it may be used later over the radio, possibly chunked according to the size of messages. 

This way, the time to exchange the actual (encrypted) message can be freely chosen.