Discrepant Event

 Discrepant events are the demonstrations that produce unexpected outcomes and are used in science to capture students' attention and to confront their beliefs about a “phenomenon by producing an outcome which is contrary to what their previous experiences would lead them to believe is true”

my demonstration - prick the balloon

Materials Required

1) A balloon 

2) A Needle

3) A clear or current tape

 Instructions

Step-1: Inflate the Balloon

Step-2: put a piece of cello tape

step-3: prick the balloon with a needle on the place where cello tape is adhered

Explanation- The balloon does not pop because the adhesive tape plays the role of a seal around the needles and prevents the air from exiting the balloon. The balloon will only pop if the air finds a way to suddenly exit the balloon.