It is a fact that all true Glaswegians can walk on one leg only throughout a complete weekend.
Their ability to do this diminishes with their return to sobriety on a Monday morning - when the inability to get out of bed and go to work overrides this phenomenon.
PS: For the record, Alex does not drink and has a full range of mobility throughout the entire week. His balance only being impaired by whichever pocket his wallet never comes out of.