Deaf people in the restaurant

I was eating in a restaurant and across from me were two women who were deaf.
They were conversing away, using sign language and then also text messaging each other .
I thought that was pretty cool that they were texting.  After they left, I notice 2 other women
conversing away, hand signs flying.  I say to myself, what's going on here? I've eaten here 100s of times
and never saw so many people  who were deaf.  On my way out, I got closer to the second pair of women, who were still waving their hands in deep discussion.  But I was wrong, they weren't deaf.  They were
Italians, just being expressive.