NEW YORK (AP) - With Super Bowl Sunday just days away, a flurry of advertisers including Budweiser and LG Electronics have already released their game-day ads in the hopes of stoking excitement and building up shares on social media.

Because ads cost up to $5 million per 30 seconds, advertisers are looking to extend buzz to make their investment pay off."More than ever we're seeing very elaborate pre-game efforts to generate interest," said Tim Calkins, a marketing professor at Northwestern's Kellogg School of Management.Here's a look at 10 spots that advertisers have released ahead of Sunday's game on CBS:Avocados from MexicoThe trade group that promotes Mexican avocados has a quirky ad showing aliens in a museum appreciating human culture, including a Rubik's Cube and actor Scott Baio.Watch online:

https://youtu.be/1ndPEQCoSzkBMWCelebrities such as Harvey Keitel and Serena Williams call the new Mini Clubman car different names like "chick car" and "short man's car" before urging viewers to "Defy Labels."Watch online:

https://youtu.be/Y9XqYAzbmTIBudweiserActress Helen Mirren calls herself a "notoriously frank and uncensored British lady" and lectures drunken drivers about why it's a terrible idea.Watch online:

https://youtu.be/Rb2VXVmUga4HeinzTo the tune of Harry Nilsson's "Without You," weiner dogs dressed up like hot dogs run excitedly toward people in ketchup costumes.Watch online:

https://youtu.be/LOlfhBT8i9IHondaSheep in a meadow sing Queen's "Somebody to Love," until their owner and a sheep dog drive up in a new Honda Ridgeline, which is also blasting the song.Watch online:

http://bit.ly/20BPSfiLGLiam Neeson talks about the future in a sci-fi spot directed by Ridley Scott's son, Jake Scott, to promote an LG TV.Watch online:

http://bit.ly/1Ku1eZwPokemonPokemon's ad for its 20th anniversary was shot in Rio de Janeiro, Brazil, and empowers children to "Train On."Watch online:

http://bit.ly/1UmGo3MShockTop"Silicon Valley" actor T.J. Miller trades insults in a bar with the orange-slice mascot for Anheuser-Busch's wheat beer.Watch online:

http://bit.ly/1WVIA3SSunTrustActor Gary Sinise urges people to let go of financial stress, "let go and breathe" and have financial confidence.Watch online:

http://bit.ly/1Px5CfHT-MobileCellphone execs ask the rapper Drake to change the lyrics to "Hotline Bling" to sound more like a cellphone contract.Watch online:

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