When I put my bed next to a door and tried sleeping next to it with monsters on.
Wait, did you say funny?
I thought it said, "MOTHERloving SCARY FGAFSTAD"
Seriously, it loving scared me. The first time it was a zombie and my reaction was: OMG ZOMBIE WAT WHERRE DID IT GET HERE HIT IT WITH FIST ASDF.
Then I puled out my sword after 5 milenia of punching and killed it.
Then I tried the bed again (Because it was still night :c) and it spawned a skeleton. Almost died, moved the bed, waited out the night. A few days later, I tried sleeping and woke up with my head in the roof. Freaked out, switched to peaceful, and built a small roof extencion.
TL;DR: Beds asdf