Steve Jobs's feet.

From the Walter Isaacson biography "Steve Jobs":

He was still convinced, against all evidence, that his vegan diets meant that he didn’t need to use a deodorant or take regular showers. “We would have to literally put him out the door and tell him to go take a shower,” said Markkula. “At meetings we had to look at his dirty feet.” Sometimes, to relieve stress, he would soak his feet in the toilet, a practice that was not as soothing for his colleagues.

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To produce the fully packaged Apple II would require significant capital, so they considered selling the rights to a larger company. Jobs went to Al Alcorn and asked for the chance to pitch it to Atari’s management. He set up a meeting with the company’s president, Joe Keenan, who was a lot more conservative than Alcorn and Bushnell. “Steve goes in to pitch him, but Joe couldn’t stand him,” Alcorn recalled. “He didn’t appreciate Steve’s hygiene.” Jobs was barefoot, and at one point put his feet up on a desk. “Not only are we not going to buy this thing,” Keenan shouted, “but get your feet off my desk!” Alcorn recalled thinking, “Oh, well. There goes that possibility.”