The 30th lyrics billie eilish

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According to various sources, including Genius and AZLyrics, the 30th lyric of Billie Eilish's song "Bad Guy" is:

"Think I'm in trouble, think I'm in trouble"

Please note that lyrics can sometimes vary depending on the version or remix of the song. If you're referring to a different song by Billie Eilish, please let me know and I'll do my best to assist you!