Mike Goodenough refused swear on set, resulting in him saying what the 'F' is going on rather at the film's climax.
Auditions were held at Dorset House School in Bury.
The film looks like a single shot but is comprised of up to 15 cuts, the longest of which was over quarter of an hour.
The films pre-production and post-production all occurred over the space of two weeks, including writing the script, auditioning, preparing the location and eventually filming the product over the course of one weekend.
Peter and Simon Hewitt wrote Surprise! over the course of a weekend whilst recording their conversations on their phones voice memo app.