In the twelth episode of the eighth season, "The Space Probe Disintegration", Grandpa is an elderly Hindi worshipper who was unfortunate enough to have a minor parking accident in the temple's car park, which dented Raj's car. Raj, worried about the fate of a space probe he collaborated in, who has just been explaining at length to Howard about the Hindu principles of the interconnection of all things and how a true Hindu should remain stoic in the face of adversity, loses it. The unfortunate Grandpa receives the full force of Raj's wrath, until Howard calms him down by telling him that the Pluto probe has now arrived safely and is transmitting pictures.
Suddenly Raj is the personification of Hindu respect to one's elders, and gives the bemused Grandpa a bow and a folded-hands: Namaste!
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