Paying for upgrade onboard...
Has anyone actually done this on CX? I wasn't sure but I think someone was trying to actually pay for an upgrade on board, he already moved to the seat across the aisle before the doors closed, the ISM was showing something with the iPad...but in the end he was sent back once we were cruising.
[The guy also snuck into an enclosed immigration section reserved for arriving Filipino passengers who cannot use the newly installed e-channel]