Pun Intended: Tales of Quips, Puns, and One-liners

I didn't know where to put this, so I made a new thread.

I read a quote somewhere that said something like the following: "Say any joke or pun that comes to mind, no matter how terrible. It will train your humor." Hahaha what a bad idea.

So anyway jumping to my tale; a friend by the name of Juan was telling terrible astronomy jokes in physics class. He wasn't coming up with them, just reading them off of a list. So after about the third joke in, I said to him:

"Juan, are you Sirius?"

And the only person who got it just stared at me with a blank, disappointed look and whispered: "Seriously?"
And then we both grinned as Juan looked on in confusion (I am not sure he understood the jokes he was telling, so sun-one had to show him up).