Nigga u srs?
If so, you might have been 'pranked' by someone with access to your computer, or there is just some really shittily annoying malware going around.
Start a proper elimination process; begin with your browser.
Does this shit happen with another browser? If not, check your browser's add-ons.
Is it perhaps an OS sound that got exchanged? Do basic shit and figure out if tabbing around, mouse movement patterns or whatever could trigger something.
If you're on Windows, check Process Explorer, or something advanced that hooks into the kernel directly rather than check with the OS what kind of files/libraries are currently drawing resources, and check suspicious/unknown files by manually by their date.
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