Why do people clink their glasses before drinking a toast? It
used to be common for someone to try to kill an enemy by offering
him a poisoned drink. To prove to a guest that a drink was safe,
it became customary for a guest to pour a small amount of his
drink into the glass of the host. Both men would drink from
their glasses simultaneously. When a guest trusted his host, he
would then touch - or clink - the host's glass with his own.