Achoo!

Achoo! Achoo!
I think I got a cold,
But I don't remember buying one,
Achoo! Achoo!
I know I got a cold,
But I don't remember receiving one,
Achoo! Achoo!
How did I come by this cold?
Oh, hello,
Let me shake hands with you,
Achoo! Achoo!
Hmm... thats weird,
Now you have a cold too