I bought Litecoin when it was around the 40USD mark in September, and bought some again in October when it was below 50USD.
The second purchase was after it had corrected after spiking to 80USD. I knew it was going to go up again soon.
Today it peaked at 250USD. I'm not sure how soon the next rally will be, but I'm going to keep my money in LTC for now.
Now, I'm waiting for Ripple (XRP) to breach the 1USD mark. Let's go, Ripple!