well if the guy is a friend or someone u know for quite some time...usually he'll behave differently from what he usually do when with u...communication (sms,calls etc) noticeably increase (like every morn msg u gd morning)...be moody or unhappy when ur close with other guys...tease u n make fun of u alot...kinda obvious actually if u just try to notice.

as for strangers...well thats obvious

if the thread title is "how do you know when a guy is interested in ur MONEY?"

then these two ans are perfect! lol