A milk truck.
or
One is really heavy, the other is a little lighter.
or
Luckily my injuries were only super fish oil
or
they make up everything.
or
``Twelve. Ya got a problem with that?''
or
Fewer than it takes to screw in a heavy bulb.
or
Hope it's Halloween!!
or
Velcrow.
or
The eyebrows replied, "no, we are just browsing"
or