Here is another technique which I had learnt from a student teacher, and which I recently applied in my talks on English reading. The student teacher was teaching a P1 lesson, and she blurred some pictures of animals and had the children guess what they were. The children threw themselves into the game.
I applied the technique, and made a few blurry text types. During the talks, I showed them to the audience (secondary students) and invited them to guess what these text types were. They responded enthusiastically.
The underlying rationale is simple: students love being challenged (before they lose all interest in learning). And using a photo editor to blur a picture is as easy as ABC.