I referenced Marcus earlier when he presented some tips on staying calm during presentations.
Recently he added some more presentation tips, including the wishy-washy one:
I liked his tip on dealing with people who start side-conversations during your talk (just read the post!) and agreed on several other tips, including the one on using presentation aids people can hold and feel.
On a presentation for a larger audience I handed out red and green paper cards that people could use to vote in favor or against suggested solutions. It really became an interactive presentation.
By the way, I kind of felt what Marcus meant with “wishy-washy” even though I’m totally unable to give it a decent Dutch translation.