The Most Suggestive Instrument (S4E5)

When an old friend of Dr. Crusher's bails on their plans, she thinks he might have fallen on the ship and can't get up. But as her story begins to unravel, squints of suspicion abound from an unbelieving (and shrinking) Enterprise crew. How difficult is a three-finger handshake? Are scarves a good substitute for grass? How old is your oldest friend? It's the episode that came back from the dead!