Jumpin Frog, a Jump & Smile fairground ride

Jump & Smile car detail. A child looks round in eager anticipation of the riding starting, while a ride attendant stares into the middle distance waiting for more customers.

The Jump & Smile is a type of fairground ride in which the chair cars are arranged on a number of radial arms around a central axis. Rides redirects here For the album by Reef see Rides (album, and for the BBC television series see Rides (TV series. As the central axis rotates, the arms are lifted into the air at pseudo-random intervals giving an erratic jumping motion. A pseudorandom number generator ( PRNG) is an Algorithm for generating a sequence of numbers that approximates the properties of random numbers