Not all celebrities who lend their voices to The Simpsons are actually funny when they do so, but Hawking always delivered laughs.
After his first contribution in 1999 with the episode called “They Saved Lisa’s Brain,” Hawking returned for episodes in 2005, 2007, and 2010.
The slide showing Stephen Hawking with young Lisa Simpson on his lap as they fly above Springfield in his helicopter wheelchair aired at the end of the March 18 episode of The Simpsons, and it made for a lovely tribute to the man who contributed a surprising amount of humor to the series.