Photo by Frank Micelotta/Fox
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The 2018 Teen Choice Awards were presented Aug. 12 at The Forum in Los Angeles and featured some of the year's biggest names including Robert Downey Jr., Chris Hemsworth and Millie Bobby Brown

Related: Complete list of the 2018 Teen Choice Award winners

This year's Teen Choice Award performers were Bebe Rexha, Khalid, Meghan Trainor, Foster the People, Lauv and "The Four: Battle for Stardom" first-season winner Evvie McKinney. Nick Cannon and Lele Pons hosted the show with great enthusiasm and chemistry. This year, the Teen Choice Awards introduced Choicey the party-loving Panda who surprised nominees and presenters with their winning surfboards, often catching them off guard - making for a unique aspect of the show. 

Here were the five best moments from the 2018 Teen Choice Awards:

1. Bebe Rexha's standout performance and on-stage surprise

Singer/songwriter Bebe Rexha gave the best performance of the night, by doing a compelling version of "I'm a Mess" on top of a giant bed, with choreography and costumes inspired by the psychiatric-ward theme of the song's music video. Later, when her "Meant to Be" collaboration with Florida Georgia Line won for Choice Country Song, she was surprised on stage by Florida Georgia Line members Tyler Hubbard and Brian Kelley. The on-stage surprise was one of the few unpredictable moments of the award show, and Rexha seemed genuinely touched.

2. Troye Sivan's emotionally stirring introduction speech in presenting "Love, Simon" with the Choice Comedy Movie award

Troye Sivan, who wrote the "Love, Simon" soundtrack song "Strawberries and Cigarettes,"  reminded the audience that teenagers, especially those who get involved in causes that help others, are making an impact in this world: "Teens are truly giving back voices to those who have been silenced and giving hope to those who have been dismissed." Sivan commented on "Love, Simon," a coming-of-age story about a gay teen and his struggles in being his true self: "It made us feel understood, and made us feel the most important thing that there is: self-acceptance." He was then joined on stage by "Love Simon" stars Nick Robinson, Alexandra Shipp, Jorge Lendeborg Jr., Keiynan Lonsdale and Katherine Langford to accept the award. In his thank-you speech, Robinson (who also won the prize for Choice Breakout Movie Star) said the movie was a "labor of love" that he hopes "will help some people."

3. Zac Efron winning for "The Greatest Showman"

Zac Efron, who won several Teen Choice Awards for the movie musical "The Greatest Showman," gave a genuinely appreciative speech that resonated with people who know about his ups and downs as a former Disney teen idol who became famous for a musical ("High School Musical"). Efron's presence at the Teen Choice Awards showed that he's not afraid of still having a strong fan base among teenagers, and that he's not "too cool" to get excited about winning an award.

4. Khalid's up-close-and-personal performance with the audience

Khalid's medley of "Young Dumb & Broke," "I'll Be on the Way" and "American Teen" chose to have his performance in the middle of the audience, with no stage barriers and no bodyguards, Khalid offered many hugs to the fans surrounding him. Khalid—who won the awards for Choice Breakout Artist and Choice R&B/Hip-Hop Song (for "Love Lies" with Normani) — was genuinely happy during his performance, and that kind of enthusiasm was a much-needed breath of fresh air. 

5. Prize giveaways during the show

For the first time, the Teen Choice Awards gave viewers the chance to win prizes during the live broadcast. Viewers had to go to the website that was announced during the show and put in the codes that were shown on screen during the telecast. With more award shows on TV trying to incorporate interactive web elements in the show, this idea of giving away prizes was a step in the right direction. Prizes given during the ceremony included products from Epiphone Guitars, Fenty Beauty, Ncredible, Headphones, Fujifilm Cameras, SNKR Inc. and Electronic Arts.