"3 truths and a lie" is a good one. Read out 4 sentences about yourself and have the class guess whether they are true or false. Have them do the same and see if you can catch them out. Make sure one of your sentences is related to football and, if you are not a fan, then pretend to be. It is a sure way to get in with the in crowd of students.
Like you have said, "find somebody who" is usefull and can be dragged out by first eliciting the questions (or simply showing the students how to form them) and by having some sort of presentation - maybe just have a handfull of students tell the class of their findings.
Put up a load of info related to your life on the board (age, date of birth, nationality, favourite sport, etc) and have the class ask you about each one.."is 01/01/01 your date of birth?"
Loosen your tie, roll up your sleeves, lean back on your chair and look relaxed.