riddle concerning existentialism

Rene Descartes walks into a bar. The bartender asks if he would like a drink. Descartes, offended, says "I think not!" He vanishes.

The Dalai Lama walks up to a hot dog vendor and says, "Make me one with everything."

The tachyon leaves. The bartender says: "We don't serve your kind here". A tachyon walks into a bar.

A Higgs boson walks into a church. The priest says: "Your kind isn't welcome here". The boson replies: "But without me, how can you have mass?"

A man goes to a psychiatrist and says, "Doc, my brother's crazy, he thinks he's a chicken." The doctor says, "Why don't you turn him in?" The guy says, "We would. But we need the eggs."