Paint yourself green, put on green clothes, and throw corn at people, saying "Ho, ho, ho!"
Then when they try to kick you out, say in any language you want: (apart from English)
"I want a ______ Guard/Cop/Policeman!"
Eg:
"Ba mhaith liom Garda Gaelach!" -Irish
(I want an Irish Guard!)
They will most likely stare at you as if you had six heads... xD