Billy Crystal could not bring himself to look at Christopher Guest during Saturday Night Live sketches, because Guest made him laugh far too hard. Their time together on the show lasted only one season, from 1984 to 1985. That single stretch still gives Crystal plenty to talk about today. Live television offers no second takes, which turned every straight face into a high-stakes performance that Crystal did not always pass.

Laughing at a scene partner is usually a rookie mistake, yet Crystal confessed to it on a very public stage.

Straight faces were no match for Christopher Guest, who had Billy Crystal cracking up on live television. Crystal brought up the memory at PaleyFest 2026, where he was celebrating his new Broadway show, 860. The 78-year-old actor sat down with Whoopi Goldberg to look back on his career and his time on the sketch comedy series.

“Chris makes me laugh like crazy,” Crystal said, according to PEOPLE.

He then added, “There were so many times I couldn’t even look at him. I would just look the other way when he had lines to do.”

The trouble peaked during Willie and Frankie, a recurring sketch where the duo played masochists who recounted self-inflicted pain. PEOPLE reported that Guest swapped a scripted line without telling Crystal. The script called for Guest to describe bathing in a vat of gin and rolling around on push pins, yet on air he opted for a far shorter way of saying he got n----. Crystal could not control himself on live television.

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While Guest supplied the laughs on stage, losing Robin Williams sent Crystal hunting for comfort in a sitcom nobody expected.

Shortly after Robin Williams died, Billy Crystal pulled Simon Helberg aside at a crowded party, even though the two barely knew each other. Crystal was traveling when the news broke, so he put on The Big Bang Theory during the flight and found it therapeutic. Helberg recalled the moment on The Big Bang Theory YouTube channel, and he still brings it up years later. Such raw honesty rarely arrives between handshakes and small talk.

Crystal was far from the only surprise fan of the sitcom, according to Helberg. Mark Hamill began watching to support Helberg, then kept going and timed his treadmill workouts around episodes while filming abroad. Selena Gomez once posted about her admiration for Sheldon Cooper, an enthusiasm strong enough that the writers briefly considered casting her. Comedy gave Crystal both his funniest struggle with Christopher Guest and one of his softest landings after Robin Williams died.

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What are your thoughts on Billy Crystal’s laughter and his comfort in The Big Bang Theory? Let us know in the comments.