Alright, I've got to give the story behind the first time I heard this joke before I tell it.
When I was 17, I signed up on my brother's cell phone plan and got my own. He told me to leave it on, even at school, and if something important happened (accident, something with the family, etc...) he would call several times so I know to pick it up.
About three weeks after I get my phone, I'm sitting in my History class when my phone rings. My brother. I ignore the call. He calls three more times, and I pick up on the fourth. As soon as I picked up my phone, I knew I had detention but I figured something bad had happened to make him call me.
Instead he had a joke. Here it is.
"A woman walks into a bar and orders a double entendre. The bartender give it to her."