When it comes to iconic guest appearances on , Stephen Hawking's cameo remains unforgettable. Yet, what most viewers don't know is the nerve-wracking experience Simon Helberg, who portrayed Howard Wolowitz, went through behind the scenes. During an interview with Conan O'Brien, Helberg revealed the deep discomfort he felt during the shoot, not just because of Hawking’s stature, but because of what the scene required him to do.

Helberg wasn’t just acting alongside Hawking; he was asked to impersonate the renowned physicist right in front of him. The scene called for Helberg to mimic Hawking’s voice and mannerisms, something that made the actor incredibly uneasy. Helberg shared his fears openly, confessing that the situation felt surreal and daunting. He was especially worried about crossing a line into insensitivity, given Hawking’s physical condition.

Despite the tension, Helberg went through with the impersonation, his heart pounding the entire time.
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