cinema experts..that=?UTF-8?B?wrQ=?=s a question for you...movie title?

Plot: two kids are playing in an abandoned shed, and when they try to
cross the shed on a wooden beam, the second kid fell down from and he
seems died (there is a blood-like liquid after he fell..), so the
first kid escaped; this kid feels guilty because he thinks for ages
that that kid with glasses died there until he seems in a party a
young man having the same gesture with the glasses as the (supposed)
died kid. So he starts to try to understand if that man is effectively
that boy....

does someone of you know this movie???
Thanks in advance!!!

Marco