I haven't really compared my forehead with many other people, but here is what I believe would happen if this occured with my crush:
"Hey, can I look at your forehead?"
"Why?"
"Oh, I need to answer a question on Fanpop."
"WHAT THE HELL IS FANPOP YOU FREAKING PSYCHO!"
"...Fine, I'll go ask him...."
....Yeah. I think it's big, though, but I have bangs.