He was probably smuggling stolen wheelbarrows into Canada, where they'll buy anything with a wheel. It's a little-known fact that wheels are forbidden in Canada under The Official Secrets Act. Wheels used in Canada must be square, not round, because TOSA sets the value of pi at 3.00 (for convenience in working problems). Any Canadian with a round wheel can be arrested and jailed indefinitely without trial.

Don't tell anyone I told you all this.