This is how I started the topic about weather in ESL in order to present vocabulary and add some adrenaline for motivation

EQUIPMENT FOR THE EXPERIMENT: a plastic bottle, an air-pump, spiritus. You can see how to do the experiment on this video

STEP 1: Play a survey about favourite seasons and have a discussion about the answers.

STEP 2: Play a quiz about clouds. To prove the last question make the science experiment about a cloud in the bottle

After the experiment I can garantee you 110 % attention for the whole lesson.