I did once.I was alone and I said Accio glass.Nothing happened of corse!I just smiled at myself and shaked head..

Oh well.. xD

I tried Wingardium Leviosa and a paper flew away xD I don't give myself props for that. It was windy that day...

Well, not really tried, but pretended to use! Does that count? :D

I tried Avada Kadavra, I looked silly instead of badass :P And I tried to produce a patronus....with a closet handle....

I had to xD

Yes, oh yes.

In history today (this is just once out of many times I have tried spells) and I dropped my pencil. I kept saying "accio pencil" until my friend picked it up for me and gave me a funny look XD. Also, I use my finger as a wand and point at people in P.E., saying Crucio whenever they humiliate me at a sport- it never works, but vengence will be mine.

Yesterday I was getting worried because my locker wouldn't open and then I said, "Alohamora!" and it opened. My spells work most of the time when I say them.

So many times

Lumos and Accio, a few times. I've never tried it with a wand though - maybe that'd make the difference ;)