On Wednesday, Seth Rogen gave an emotional address about Alzheimer's disease at Capital Hill, where he soon found himself very disappointed at the empty hearing due to U.S. senator's poor attendance.

The Pineapple Express actor began his speech by breaking the ice in what would normally have been a dry subcommittee hearing. "This has nothing to do with the legalization of marijuana," he joked. "In fact, if you can believe it, this concerns something that I find even more important."

Rogen even poked fun at Committee Chairman Tom Harkin, who had no clue who he was. "I don't know if you know who I am at all," he said. "You told me you never saw 'Knocked Up,' chairman. So, it's a little insulting." Harkin responded: "I will wager this is the first time in any congressional hearing in history that the words, 'knocked up' have been used."

There is a reason why speaking about the devastating illness is quite a touchy subject for the 31-year-old actor: his mother-in-law Adele Miller was diagnosed with Alzheimer's disease as well. "I started dating my wife Lauren nine years ago when her mother was almost 54 years old. It was during this trip, the first time I met my now mother-in-law, that Lauren first admitted to herself and then to me that something was off with her mother," he said. "Soon after this trip at 55 years old, Lauren's mother was diagnosed with early onset Alzheimer's."

Miller's disease did not only begin early in life, but also progressed quickly. "After forgetting who she and her loved ones were, she forgot to how to speak, feed herself, dress herself, all by age of 60."

Rogen testified to the Senate Appropriation Subcommittee on Labor, Health, and Human Services, Education and Related Agencies members how his view of Dimentia changed as he watched Miller's ability to take care of herself withered away. "The situation is so dire, that it caused me, a lazy, self-involved, generally self-medicated man-child to start an entire charity organization," he said.

The Knocked Up actor started his own "Hilarity for Charity" with his own wife Lauren Miller to support other families and research on the illness.

"I came here today for few reasons," he added before speaking in support of legislation that would increase funding for Alzheimer's disease. "One, I'm a huge 'House of Cards' fan. Two, people need more help. I've personally witnessed the massive amount of financial strain this disease causes. Three, to show people they are not alone, so few people share their personal stories."

However, Rogen was not at all happy about only two senators, Iowa Democrat Tom Harkin and Kansas Republican Jerry Moran, showing up to listen to him and even watching many of the committee members leaving before he addressed them. "Not sure why only two senators were at the hearing," he wrote on Twitter. "Very symbolic of how the Government views Alzheimer's. Seems to be a low priority."

"All those empty seats are senators who are not prioritizing Alzheimer's," he tweeted following the hearing. "Unless more noise is made, it won't change."

Senator Mark Kirk then made a brave move by daring to thank Seth Rogen for his speech via Twitter. "Thanks to @Sethrogen for speaking out about efforts to #ENDALZ. RT if you know someone affected by #Alzheimers," the Illinois Republican wrote.

The Alzheimer's disease activist shot back immediately: "Pleasure meeting you. Why did you leave before my speech? Just curious."