now you're talking Ivona.
yes, you had every right to be angry. I would have been too!

If you really think he let air out of your tire (are you SURE he did it?) you could let air out of his tire too, but then the next thing you know, your bike will be missing spokes, or.... like bleeker said, it could get much worse.

Lucky you had this place to vent, it's better than revenge.