Call your crush or just some one of the opposite sex and ask them to come over ..
whilst they are on thier way write a note on the door saying to come on in and then strip down and tie yourself to something watch there reaction when they see you
my friend has done this one and found 2 hours later that his crush wasn't able to come round i had to bail him outta that one
P.S for those of you that are really daring ask someone of the same sex to come over