How do I break my uncle's TV without my aunt noticing?

Depends on the TV since it is pretty old.

If it was the last of the DLP TV's, the bulb is either on the left or right lower side of the TV. You can yank the bulb, give it a smack, and re-install it. The picture will be f-ed.

Plasma, you have to go after the input jacks. HDMI -> screwdriver -> break a couple of the pins. Composite, use an old RCA cable, insert it and give it a tug.

LED you have some fun stuff. If you have time, popping the back of the TV off is easy. There is a driver board in there. Pull the board, use some small wire cutters and just pop a few circuit pathways right off the inputs. Re-install the board.

For fun at work, we soldered a piezo speaker to a driver board power loop. Power came on and it would emit a terrible sound.

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