Jesus understood that He had more authority than anyone on the earth... so He served His disciples in the lowest, most menial task! That's amazing to me. In my experience, that's just not "normal"! People who understand that they have great authority usually DON'T spend their time doing menial tasks. They have others do those things for them.
If I had been one of the disciples in this passage, I imagine that I would have been squirming uncomfortably in my seat while my Lord and Master stooped down in front of me to do something that ANYONE could have done. I suppose I would be chastising myself for not making sure that it had been taken care of earlier. And I'm sure the image of Mary washing Jesus' feet with the expensive perfume would still be fresh on my mind.
I wonder when it would have occurred to me that this act wasn't about Jesus drawing attention to my dirty feet, or elevating foot washing to the level of tradition or sacrament, but demonstrating His love for me.
"[Jesus] had loved his disciples during his ministry on earth, and now he loved them to the very end." (v 1b)
How can I ever love others the way Jesus loves me?