Are these good signs with my jokes?

I made up my own pick-up line (not inappropiate). I told a girl I like it and she smiled and said "Sure..."

Another thing is, I like someone who is a big star trek, would it be a red light to tell her this joke:

"What do Star Trek and toilet paper have in common? They both circle Ur-anus looking for cling-ons. LOL
 
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