Every once in a while(seems only when I'm in first or shifting to second) I get a crazy thump out of my transmission. I had a camaro back in the day and it did the same thing during shifts and that was due to a broken tranny mount. My car has about 1400 miles on it and this has happened about 3 times that I can remember. Once was when I took off from the line pretty hard and dumped at about 4. Then this morning driving to work. I pull out of my driveway and take the r's up to about 5k. Clutched to shift to second and as soon as I put the clutch in.....THUMP!!
Anyone else have anything like this happen to them? It's starting to really **** me off. A brand new car shouldn't do things like this

 

OK I just got back from lunch and I tested a few different ways of taking off to see if I could get it to happen again. Every time I take off slow and let off the clutch out slowly, then punch it and take the r's up to 4k, it does this. You can feel it in the seat and in the console area and you can also hear it very much. Its a loud BUMP!! ANYONE?