Clone threads started elsewhere, Flint brought them to us.
Dolphins started here with
this thread. The question of whether it was dolphin or shark was asked and solved elsewhere, but it was meme'd here.
Hobos you will have to ask IM, I think she started killing hobos as a hobby and brought it up here.
The plane on a treadmill question started being asked widely on the net. knowyourmeme.com does not consider it a meme.
Whale penis is ours; it first appeared in
IOTD. Sycamore even started a domain for the church of the whale penis at one point. He also created a
Facebook page for it. At first we wanted the Cellar to be #1 for the term "whale penis" in google. We were at one point, but have since fallen completely off.