An amusing video has emerged of a woman walking in upon two of her friends belting out a cheesy pop song.

The footage, taken in Pullman, WA, USA earlier this month, captures the look of surprise and confusion on the woman's face when she sees her friends recording a video of themselves singing Rae Morris' 'Do You Even Know?'

She stands there for a full 30 seconds before the singers realise, to their embarrassment, that they have an audience.

"Maarika's [left] boyfriend had broken up with her. To help console her, Regan [right] decided they should sing Do You Even Know --an angsty pop song that Regan had written two years prior when she had gone through relationship issues that they always poked fun at together. Reading the chord progression off of a word document, they failed to notice when their friend Becca silently walked in behind them. Becca, interested in the dramatic performance in front of her, decided to stand watch. As Maarika goes to switch windows and end the recording she suddenly notices Becca standing at the door behind her and hilarity ensues," the uploader wrote online.

Maarika's [left] boyfriend had broken up with her. To help console her, Regan [right] decided they should sing Do You Even Know --an angsty pop song that Regan had written two years prior when she had gone through relationship issues that they always poked fun at together. Reading the chord progression off of a word document, they failed to notice when their friend Becca silently walked in behind them. Becca, interested in the dramatic performance in front of her, decided to stand watch. As Maarika goes to switch windows and end the recording she suddenly notices Becca standing at the door behind her and hilarity ensues.