what?

The other day at the pool I was talking with my brother.

Him- Look at that plant.  It is taking over the hammock.

Me- I know.  She keeps cutting it back, and it keeps getting worse.

Him- I can't believe how big it is!

Me- What IS it?

Him- Chlamydius. 

Me- What?

Him- CHLAMYDIUS.

Me- (brief silence, while I racked my brain) Clematis?

Him- Yeeeaaahhh, that's it.  Clematis.

Me- Were you trying to say "chlamydia" and "clematis" ?

Him- (laughing) Yeah.

Me- Like it is a loose plant? 

More laughter.