Have you ever heard of Platform 9 and 3/4 ? Well, I can think of something else with those measurements. 

Going to bed? Mind if I Slytherin? 

Have you been using the Petrificus Totalus spell? Because you’ve made me stiff.

Yeah girls call me “Aguamenti.” Everytime they hear my name, they get wet.

Did you just cast a spell on me baby? ‘cuz I’m feeling an engorgio charm coming on.

And then this is for the ladies:

I’m like the spine on a care of magical creatures book; if you stroke me right i’ll open wide for you.

And this would be a guys reaction, especially if you said this to a Potterhead: