geez... this is something my brain just does. They're like earworms where my brain gets stuck in a loop or something. Drives me bonkers sometimes. And it's not just swapping initial sounds. It could be swapping internal vowel sounds or ending syllables. It's how Bradley Cooper has forever became Boodley Crapper in my fucked-up noggin...
I'm not the only one!
I drive people crazy in conversations because they'll be talking to me, and instead of keeping the conversation going I just repeat back what they say as spoonerisms. Also, backwards speak. When my brother and I were little we would be bored lying in bed unable to sleep so we would have conversations saying every word backwards and then try to figure out what the other was saying. We got pretty good at it to the point that my brain processes a lot of what people say backwards and forwards. I'm not as quick about it as I used to be, though.
Same here. I started doing it as a silly thing to tease/bug my girlfriend but now it's become a permanent part of my personality. I will now only say "jadies and lentlemen", and I did it so frequently that she says it too.