Il ya longtemps que un joueur espagnol (
Capcom) a découvert une façon de prendre le canne en
MODE NORMAL, mais il est nécessaire de perdre une vie.
I'll explain it in english so you don't have to deal with my poor web-translated french
First you need a black lamp (or at least the skill of launching two bombs and the tropical flower).
Then you have to "fly" to the bobble.
As I said before, it's necessary to lose one life in the process. Instead of going directly to the bobble you have to commit suicide with the nearest spikes. You have to fall over the spikes in the proper way so you got propelled to the bobble. At that time you are already dead and the bobble doesn't dissapear.
I couldn't test it because i don't have the key but i really trust this guy.
The original topic
HERE for those of you who speak spanish, and an image to ilustrate my explanation
HERE.