Dude's got it spot on. When I was at the Laundry, my wife and I were brought a course of lobster with a candied piece of fennel precariously balanced on top. When the food runner set down our plates, my piece of fennel fell off the lobster and cracked....my food runner immediately went to grab the plate and said, "I'm so sorry, I'll take this back." I was like no, it's totally cool...you could literally see the food runner's face go from utter freaked out constipation to Sean Penn Spiccoli laid back in the blink of an eye...
He then said, "Thanks for being cool. I was in vegas last night and didn't get much sleep, my hand was a little shaky." I laughed and said, "Yeah, I bet Keller would have beat you if you came back with the plate." He gave me a knowing look, and said, "Yeah, he's tough."