I have a problem. Okay so, when a girl shows interest in me I can easily "pick-them-up". However, when a girl shows absolutely no interest in me (I say something and they give me late responses and showing lots of IOD); I don't know how to catch their attention. This is in a group setting that I'm having this problem. For example, during passing time in high school... or at a party with large social groups.

I had a few ideas that I haven't tested yet...
1) start a conversation with them and show a lot of IODs

The others I do not think are even worth posting, and I could use some help with this! Thanks