Unfortunate.
Because they can't put their finger on it.
Because he said he only loved her this much (hold out t-rex like arms) Sorry this one requires a bit of a visual, but I thought you guys might like it
A man holding an aardvark.
A Rottweiler in a playground.
Wheeeee!!!! --hey, at least it's a fun joke for kids!
Having to tell your friend his kids should get tested.