This may just be the best classroom prank ever.

Students at Aquinas College in Grand Rapids, Mich., recently pulled one over on their professor, who has a strict policy on cellphones -- if it rings in class, you must answer the call on speakerphone.

A video that's since gone viral shows professor Stephen Barrows telling student Taylor Nefcy to answer her ringing phone.

She does, only to be greeted by an unexpected message:

"Hi, this is Kevin from the Pregnancy Resource Center. Per your request, I am calling to inform you that the test results have come back positive. Congratulations." 

Barrows is mortified, but the call only gets better:

"There is no need to worry," says the caller. "I know you told us the father is no longer in the picture, but we will be in contact with you throughout this whole process, so don't worry about anything. We provide counseling and other maternity services at no charge."

Barrows apologized, but Nefcy tells him it's all good.

"I've been expecting this and I already know what I'm going to name the baby. Her first name will be April and her middle name will be Fools," she says as Barrows bursts into laughter.

Watch the video below: