Mine would have to be Oops I Did It Again, it'd just be the start of the chorus. I think that would nearly always fit the situation.

Since in most scenarios I'd prefer people left the room when I entered, I don't know- the opening SCREAM from the President song In The Name of The Father?

And his name is John Cena!

"Fuck you, I won't do what you tell me!"

"Hi there. What can I do for you?"

Obviously the opening "Heeeeere we are!" from Queen's "Princes of the Universe"

4′33″

The opening theme from the Adventures of Brisco County, Jr. that's currently being used in the Olympics.

Realistically, that would get annoying pretty fast and I'd soon learn to hate any song I chose. So I'd pick 4′33″, which is four minutes and 33 seconds of silence.

But otherwise I'd pick "One Bad Tank", from the video game Left4Dead2. It's the song that plays when the boss enemy enters a particular map.

Your wish is granted.

I Touch Myself

Made me think of the sound when you encounter a Pokemon in the OG gameboy versions.

It's been a long road, gettin' from there to here.

Slayer

You could also do the Steve Austin “Won’t Do What You Tell Me”. Glass shatters

People = Shit cover by Richard Cheese. It’s classy and represents my honest feelings at the same time.

Technically, this still fits the description...

Either the opening of take me out or a little ways in to pinball wizard if it has to be very short, if longer than the opening from people say I'm over the top

That first part of Crocodile Rock by Elton John. Really encapsulates the fact that I’m a silly willy.

Mine is same song, but when everything except Jeff's guitar cuts out for the breakdown riff.

The clip used for Dramatic Chipmunk.

https://www.youtube.com/watch?v=mfhBM_Yay6w&t=5

I heard it in my head before I clicked. This might be my favorite so far

Yar har feedle dee dee...

"Counting all the assholes in the room, well, I'm definitely not alone"

Still Counting-Volbeat

Starwars' Imperial March

Intro to my own summer Deftones

The chorus of XIII. Stoleti's Elizabeth.

Darth Vader's imperial march. It's also my ringtone...and does play when I enter a room occasionally...if I get a phone call as I enter.

Jeff Beck, "Going down".

From "Young Frankenstein", by the way. I couldn't resist finding out where that came from. It's the scene where they first arrive at the castle.

The bagpipe ditty the door plays in the SNL "All Things Scottish" skit. Wonderfully annoying.

https://youtu.be/DCkVJk4_ddk?t=37

O Fortuna (Carmina Burana).

Baby shark. So I stop getting invited places.

There can be only one.

How long have you been a Streetfighter?

Short People

I just can't see it.

Holy shit it is the Adventures of Briscoe County Jr. theme!

It's not some classic composer or something; it was literally written for that show and since it was such a good song and the show got cancelled after one season they totally snatched it up!

https://ccmpr.wordpress.com/2014/02/19/nbcs-2014-olympic-coverage-features-the-iconic-music-of-ccm-alumnus-randy-edelman/?hl=en-US

I'd go with Necrophobic so that people get the impression I stayed at the party for twice as long as I was able to manage.

Picture it... Henry Mancini - Baby Elephant Walk starts playing. You walk in. Double finger-guns. Wry smile. A wink for every person in the room.

Wilhelm Scream

SALSA COOKIES

The very first part of Locke's Theme by Sean Schafianski (from Final Fantasy 6)

You sir, are an evil person. May all your streaming services only play "Section 31" from now until the end of time.

I like Omen, but it's not as good if a walk in song. Great soundtrack top to bottom though.

Obviously Gonna Fly Now

I love me some Richard Cheese cover versions. He knows exactly where to take other people’s songs.

Audrey's Dance

If you want to come across as the murderous villain you might as well pick bodies by drowning pool. Or pumped up kicks.

GETTING STRONG NOW!

WON'T BE LONG NOW!