Great ones.
"confuse the ghosts by donning wigs!"
Hopefully black.
And now for the definitive fill in (based on the wording of the set up):
"Barnabas believed he had a scathingly brilliant idea when it occurred to him that the way they could avert the impending catastrophe was to screen
The Trouble With Angels out in the garden!!"
(Not everyone will get the reference - but those who do are probably
now. I know some were already
just at the set up - and you know who you are... (Though all the info needed to understand it is right here in this post.))