Here are some of the other ones I remember off the top of my head:
Nathan Lane and Elaine Stritch, there together, at Grey Gardens when it was still at Playwrights
Jimmy Fallon at Rock-N-Roll on Broadway
Patricia Wettig and Patrick Breen, together, at John at Signature
Gina Gershon at Other Desert Cities when it was still Off Broadway
Joan Rivers at Driving Miss Daisy (Vanessa Redgrave/James Earl Jones production)
Alec Baldwin at the final performance of The Anarchist
Natasha Leggero and Riki Lindhome, together, at She Loves Me
Will and Jada Smith at Fences
James Franco at Cat on a Hot Tin Roof (Scarlett Johansson production)
Wallace Shawn at Gloria at the Vineyard
Terry Gross at Fun Home when it was still at the Public
"You travel alone because other people are only there to remind you how much that hook hurts that we all bit down on. Wait for that one day we can bite free and get back out there in space where we belong, sail back over water, over skies, into space, the hook finally out of our mouths and we wander back out there in space spawning to other planets never to return hurrah to earth and we'll look back and can't even see these lives here anymore. Only the taste of blood to remind us we ever existed. The earth is small. We're gone. We're dead. We're safe."
-John Guare, Landscape of the Body