I solved some time ago "Welcome to Fire Island" with gold, and went to repeat it. It's fun to replay solved levels.
One Kaboom is destroyed easily and of course I did it. But I don't remember the exact time to do what I did now accidently...
Explanation. What happened is that I set all three remaining Kabooms free. I wanted to wait for them, get bonus and go in exit...
I got +750 for destroying three kabooms!

I want to do it, but since I don't know the time, I can't put it in level in the future without going mad.
Who can call himself "Kaboom Manipulator" and can repeat it any time -- this is for you!
Sorry it was too unexpected for me and I can't repeat it so no screenshot.