I had to explain the data usage of an interface that looked extremely busy from the standard graphs

I did a percentile graph of the usage - the data was only typically using 5% of the maximum throughput, no-one could really understand the graph though

so I did a zoomed-in version of the normal data usage graph and it looked like a blip lasting 1/20 of the time - everyone got that - eg it was peaking every few seconds and then doing nothing for ages