Going Insane!

My office at CPUT is above and adjacent to a construction site. The university is expanding the Mechanical Engineering building to accommodate students and staff who will move here from the Cape Town campus, in an attempt to consolidate the department onto one campus. Politically, the road has been bumpy. And, the construction is making me pull my hair out!

See some photos below.

I went to the airport tonight after class to pick up Jim and Henriet. However, their flight actually arrives TOMORROW, not today. Here's where it gets interesting. I have to go to Johannesburg tomorrow for a meeting, and I'm scheduled to take the same flight from Joburg to Cape Town that Jim and Henriet are taking. But they don't know it. Any good ideas for a practical joke I could play on them?

--Matt