Here is an animatronic expert preparing a shark for deployment in an Islington fishmonger's.
Here is a shopper reacting exactly how you'd expect her to react when you're in the fishmonger's and a shark lunges at you.
Here's another shopper doing much the same.
Interesting fact: when you get older killer sharks just don't bother you that much.
Why? Publicity stunt. What for? Sharknado 2, which on balance sounds like the worst / best film ever made.