Really long castling

I've been trying to keep an eye on the Chess960 from St Louis while running an Arbiters Seminar in the Solomon Islands. While I'm not a big fan of the format (at least in serious competitions) it does have its moments. In one of the early games, the start position had the kings on c1/c8 with rooks on either side. The games looked pretty normal, until most of the back rank had been cleared, when suddenly the kings moved from the c file to the g file, dragging the d rook with them. While legal in Chess960, it still came as a bit of a surprise.