After getting canned from a too-stressful corporate job, a friend of mine decided to try the other end of the spectrum, and got a job driving a hearse. His repeated boast: "Never got a single complaint!"
His wife, tired of hearing this, asked for my help to prank him...so here's what we did:
We got a 90 minute cassette, and fast-forwarded it to near the end of the first side. Then she recorded me disguising my voice, muffled through a pillow. And right before she kissed him goodbye, she set it to "Play".
...about 44 minutes into the drive he heard a frantic muffled voice screaming:.
Hey! Hey, what's going on? Lemme outta here! LEMME OUTTA HERE!!!
Legend has it, he had to change his underwear.