They didn't know you could get Britain to leave by voting.
Because she didn't know which one came first!
Disclaimer: I don't know how well this joke will work in English. What's yellow and lies in a pond? An excevator. You don't think this is funny? Neither does the operator.
Not being British.
Because all the fans left
Vote!
Last time she tried Democrat it left a bad taste in her mouth.
Brexit
Connect the dots. (I'll see my self out.)
Re-arranged marriage
When one votes, it changes something, making things worse. When another votes, it doesn't change anything, making things worse.
The tea towel
The elephant of surprise.
GirlFriend: You told me to surprise you.