On ocasions it might be an ice breaker. I have started to use a few scenes from movies (not quite reaction gifs) as boundaries on some presentations to make the

On ocasions it might be an ice breaker. I have started to use a few scenes from movies (not quite reaction gifs) as boundaries on some presentations to make the audience laugh (a bit of relief from very technical topics) and also add a clear boundary where I can ask them "did you all get that? let's move on to another topic then".