A lot of things determine how likable you are.  Obviously your personality and your looks are two BIG ones.  But here are some WEIRD things that make people like you more. 

Asking for a Favor.  But only if you say "thank you" afterward.  Studies have found that asking for a favor and saying "thank you" make you more likeable than actually doing a favor for someone.  It's partly because we subconsciously like it when someone owes us a favor.  It's also because when you do someone a favor, they forget about it pretty quickly.  But when they do YOU a favor and you thank them, it sticks in their mind.

How Good Looking Your Friends Are.  Researchers tested this one by setting up two fake Facebook accounts that were exactly the same.  The only difference was, one of them had HOT friends, and the other didn't.  Then they showed both profiles to people, and asked if they'd like to meet the person.  In the end, people were 20% more likely to want to meet the one with good-looking Facebook friends.

Embarrassing Yourself in Public.  A bunch of studies have shown that when people see you embarrassed, it makes them think you're nicer and more trustworthy.  It makes sense when you think about it, because if you're the kind of person who gets embarrassed easily, then you're also more likely to be nice to people so you AVOID embarrassing situations.  But obviously it's ironic, since we try so hard NOT to embarrass ourselves in public.

But those aren't the only things.  Look into what else can make people like you here.