The show is full of clever word play, silly jokes and mad improvisations. Yes, it's stupid, but the kids love it and much to my surprise I really rather enjoyed it too. Andrew Jones and Ciaran Murtagh work so hard and play the audience so skillfully that you soon find yourself grinning as inanely as the kids. The standard is consistently high and this hour of madcap fun does its job.

Certain words are guaranteed to make children and juvenile adults laugh. Professor Ivor Bumm and Doctor Willy Whee seem to know most of them, but there's more to this hilarious show for the over-sevens than toilet humour. Andrew Jones and Ciaran Murtagh are masters of improvisation.

How to get an audience of children on your side instantly: introduce yourselves as Professor Ivor Bumm and Dr Willy Whee - then drench them with a giant Super Soaker; simple, but effective. The two anarchic boffins then proceed to make it all up as they go along. They ask the audience for a few key words and spin them into barmy ad-libbed fables - about a six-year old electrician, a giant with traffic-stopping feet and a Women's Institute cake fight. They make a great job of it and have a keen eye for material that can make young audiences roll about.

Improvised stories from this inspired comic duo who rely on audience suggestions and their unusually quick thinking comedy talent to create absolute mayhem and anarchic fun. Engaging entertainment for kids of all ages - thanks in no small part to the energy and quick thinking creativity of the pair.

It is a simple formula but an effective one. Take two eccentric eggheads, name them Professor Ivor Bumm and Doctor Willy Whee, equip them with a schoolyard’s worth of scatological jokes and then sit back and watch an audience of assembled kids squeal and giggle. The performers seem to be having almost as much fun as the kids, who, in the real acid test, remain totally enchanted and fidget-free throughout.

Professor Bumm (Harry Hill’s doppelganger) and Doctor Whee (yes really!) unveil their latest invention - The Story Machine (think HAL crossed with Steven Hawking). What we get is largely improvised madness that relies on the imagination of the children in the audience. Not the most sophisticated comedy, but certainly the most fun I’ve had all festival so far. I wish my parents had taken me to see stuff like this! Brilliantly bonkers!

It is a pleasure to see a children’s show in which the adults are laughing as hard as the children. Under the guise of covering the machine’s malfunction Bumm and Whee create the stories on the spot and brilliant stories they are too. Jones and Murtagh work with, and sometimes against, each other to push their creative levels to the limit and the result is a delight. Each story relies on a different technique, from props or sound effects to creating a tale by alternating every word between the two actors. Go and see this one.