I usually just yell at myself for having a blond moment and then laugh about it later.

I was once testing a prank TI-Basic program on my TI-84+ SE, designed to take calculator input like normal but screw up math ops, which I only wrote with the ability to parse math operations such as +, -, /, *, ^, sin, cos, etc. I decided to, regardless, try to input a draw command and pressed 'ENTER'. Suddenly I was confronted with a blank screen and so I pressed the 'On' button and, poof!, RAM cleared, along with the program I was working on! The stupid thing is that TI-Basic programs aren't even supposed to be able to wipe the RAM like that! Poof! Everything not in the Archive gone! I hadn't thought that the program could be harmful, so I hadn't backed my coding work up to the Archive, and my coding work was a lot. Ouch!

Excimer-Sun-Software
I once coded a simple quadratic calculator in TI-Basic for my friend who was too lazy to learn TI-BASIC/input the quadratic equation/find the program already built in to the calculator. I "accidentally" put a negative sign in the front of the equation...and he didn't check his work on the test.

bchandark

Oh dear! I guess his laziness ended up hurting just a little eh? Hehe, I like the expression you used there:


"accidentally", lol!

Excimer-Sun-Software
And the language is really easy to learn, too!
It could take less than 5 minutes to learn TI-BASIC enough to make a quadratic calculator.

Yeah! It was the first language I learned! The only language that is comparably easy to learn is Python. And Python is much more powerful and extensible. Though I love Python, I still like TI-Basic. I even once wrote a partial HTML interpreter in Ti-BASIC. If I remember correctly, I managed to implement an interactive interpreter that was capable of understanding <marquee>, <big>, <h1>, and <h2> before I moved on to other things.