A man thinks that his Siamese twin is a vampire, but it turns out that the vampire just used his amnesia in order to hide in plain sight after using some plastic to connect the two of them.
Reprinted:
from Astonishing (Marvel, 1951 series) #35 (October 1954)
A young man invents a girlfriend for himself, but comes to regret it when he tells people he's meeting her that evening at the bridge, and a body is found floating in the river which matches his description of his girlfriend. He is convicted of murder and executed.
Reprinted:
from Astonishing (Marvel, 1951 series) #35 (October 1954)
A criminal buys a trunk at auction that makes anything put inside disappear. He figures he can use it in order to eliminate murder evidence, but as he is lugging it down the stairs, he stumbles and falls into it.
Reprinted:
from Adventures into Weird Worlds (Marvel, 1952 series) #5 (April 1952)