Crazy subtle things to warp peoples minds and gently disturb the status quo

Eat a sandwich with a fork and knife. 

Stand at the arrivals area of the airport with a sign that says 'Madonna' or 'Brad Pitt' (Andreas, I love these ones - Brilliant) 

Other suggestions

'undercover FBI agent'

'you'

'welcome to london' (when not in london)

Ketchup???

The ingredients on Coronet Tomato Ketchup packet

Water, Glucose-Fructose syrup, Tomato Paste (15%), Modified Maize Starch, Salt, Acidity Regulators (E260, E330), Preservative (E202), Spice Extracts.

(Now check this out)

Caution,

*May contain nuts, peanuts, sesame seeds, mustard, celery, fish, eggs, milk, soybeans, sulphites, and cereals containing gluten.

Why is there more actual food in the ‘caution may contain’ section than there is in the ‘ingredients’ section?