Obi-Wan should have left a whoopee cushion in his cloak for Vader to step on, just to troll him one last time.
With some sand in it!
‘I don’t remember this scene from Star Wars. Uncredited illustration from the Screen Superstar Star Wars special (1977)’: https://twitter.com/retroscifiart/status/1622003462627282945
Nor do I! Poor guy. Or clone. Or robot or monster or whatever he was meant to be at the time.