Ah, you must be relatively new to anime then. I myself was like that for the majority of my life but then I found out that I have preferences.
Well, that being said, here are a few that I'd reccomend.
Welcome to the NHK
SisXKiss(it's a strange yet funny one that has actually happened for many kids.)
Girls' Bravo
Serial Experiments Lain
Wolf's Rain
The Melancholy of Haruhi Suzumiya
Those are the ones that I'd reccomend at the moment. Word of warnin' with Serial Experiments Lain. You will not likely understand it the first time you watch it. I've seen it three times and still have a somewhat tought time with some parts. But all-in-all I got it the first time. Well, have fun with them cuz they's all good and most, if not all, are classics that you HAVE to see.