I know this method has been around for years - even at the age of 25 I still find myself saying "dashing in a rush, running hard or else accident" (not that this is a word I have to spell often!) - but for some reason I'd never thought about using it in MFL.
After I found the technique worked for one student I asked him to share this with the class and encouraged them to use it as well. They came up with some ridiculously silly sentences but it really did help them to remember the spellings.
Have you done anything like this with your students? Do you have any better techniques for learning spellings? I'm open to new ideas!