Swanson's disease

A disease similar to Parkinson's disease
Swanson's disease has 5 stages, each stage getting progressively worse until you reach stage 5, where you lose the ability to make wise financial decisions
Stage 1 symptoms: Mild shaking in both hands. Engineering Textbooks become especially hard to read.
Stage 2 symptoms: A higher degree of shaking in all limbs. Loss of general motor control
Stage 3 symptoms: Similar to Parkinson's disease, loss of motor function

Stage 4 symptoms: Engineering prowess exceeds all others, reverts to stage 1 symptom

Stage 5 symptoms: The victim has the urge to form a lacklustre engineering company. Designs wall sockets with structural beams running through the centre

Fred: 'Did you hear about Han's diagnosis of Stage 5 Swanson's disease?'
Mogus: 'oh dear'