You will need:
A parachute (play or otherwise) or an equivalent large sheet/cloth.
Everyone sits on the ground with their legs stretched out under the canopy and the canopy held at chest height. One person becomes the ‘shark’ and crawls around under the canopy. They quietly grab the legs of anyone around the perimeter, who with many blood-curdling screams, allow themselves to be pulled under the canopy. This continues until all caught.
An alternative is that players once caught and under the canopy can also become a shark.
Younger players might find this a little scary so be aware.by