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\u201cThe Late Show with Stephen Colbert<\/a>\u201d came to a climactic and possibly interdimensional end on Thursday night as the show\u2019s final guest led a rousing sing-along<\/a> to an almost too-fitting song. <\/p>\n<\/div>\n Throughout the show, bizarre \u201ctechnical difficulties\u201d kept occurring, much to Colbert\u2019s chagrin. When the late-night host finally had enough, he meandered backstage to find the culprit: an interdimensional portal destined to swallow him at the conclusion of the show. <\/p>\n<\/div>\n Some special guests showed up to try and explain the portal, including \u201cDaily Show\u201d host Jon Stewart<\/a>, astrophysicist Neil DeGrasse Tyson and fellow late-night hosts John Oliver<\/a>, Seth Meyers,<\/a> Jimmy Kimmel<\/a> and Jimmy Fallon<\/a>. <\/p>\n<\/div>\n \u201cYou can\u2019t ignore it. The only choice you have now is how you choose to walk through it. You can go kicking and screaming,\u201d Stewart said.<\/p>\n<\/div>\n \u201cThat one,\u201d Colbert said.<\/p>\n<\/div>\n \u201cOr you can do what you\u2019ve done for the past 30 years when faced with something dark. You stare it down, and you can laugh,\u201d Stewart said. <\/p>\n<\/div>\n As Colbert returned to the stage, the portal suddenly appeared on the ceiling of the Ed Sullivan Theater and sucked him and his studio audience into what we can only presume is late-night purgatory. <\/p>\n<\/div>\n Colbert concluded the show by joining some music legends for the program\u2019s two final performances, one alongside Elvis Costello singing \u201cJump Up\u201d with current and former \u201cLate Night\u201d bandleaders Louis Cato and Jon Batiste, and the other featuring Paul McCartney singing \u201cThe Beatles\u201d song \u201cHello, Goodbye.\u201d The latter performance saw Colbert\u2019s wife, producer Evelyn McGee-Colbert, and the show\u2019s staff join Costello and Cato and the Great Big Joy Machine in singing the aptly titled song. <\/p>\n<\/div>\n