One of things that most impressed my little mind during my earliest memories of 770 was how the Rebbe pulled the chair in behind while getting ready to sit down. The Rebbe reached back with his right hand and pulled the chair, which would turn the chair towards the left. And the Rebbe would straighten the chair without using the other hand, just by forcing the chair straight with the right hand, It was a pretty heavy chair, I think.

Also, in the Nuns, or maybe also earlier, when the Rebbe was saying a Sicha very often during the week and giving dollars even more often, there was a Siman that the Rebbe used, to indicate to Leibel that there would be a Sicha. Something with the hand...? Anyone remember? Am I making this up?

P.S. In connection to Birchas Kohanim...duchening in 770 by the Rebbe (Shavuos nun alef) was a mind-blowing experience for the midwestern boy. First of all, getting to the sink and back to the Bimah...that took a while. Then, you need to find a Tallis. Then you go up on the Bimah and get your shoes off...and stand on them if you want to get them back....

After Duchening, during Sim Sholom or Kaddish, I remember that the Rebbe's Tallis slipped all the way off...a sight. Anyway, as we filed off the Bimah, the Rebbe, who was standing just to the left of you as you went down the steps, nodded and said Yasher Koach Kohen to every Kohen, I think. I know I got one.