I was lucky enough to be in the cockpit of a CX 747-400 attempting to land in a rainstorm at JFK. The preceding aircraft didn't appear to have quite cleared the runway and the pilot called a go-around at the last minute.

As another poster stated, the worst part of the affair is the lengthy delay being resequenced for landing. After flying over the southern part of Queens, we headed back out over the Atlantic for several minutes before being vectored back into the pattern.