Very cool.
On one of my earliest pace line experiences I had joined in late after 10 miles of a 35 mile push into a nasty headwind (I was picking up some young riders and turning over the sag van when I saw them coming. I rushed my bike down and jumped onto the back). They didn't know me but considered me "fresh legs" and rushed me up to the front ("get those fresh legs up here" was the holler from the front). I was just tickled and really worked hard to help out. But after an hour I was gassed, fell off the back, and couldn't seem to catch them again. I was in tears (part exhaustion, part amazement) when I saw they were sending back two riders to get me. I'll probably remember that moment till the day I die.