Deuteronomy 6:22
Moreover, the Lord showed great and distressing signs and wonders before our eyes against Egypt, Pharaoh and all his household;
Interesting choice of words here. First, the linking the terms "great" and "distressing" is an odd juxtaposition. We all can understand what he refers to when he speaks of the great things that God did for the Israelites. The lengths He went to to secure their freedom were certainly impressive. However, we don't like to think about them as being distressing. They certainly were, however. Many were sick, many hurt, and of course many died in the Plagues. Every one of them was meant to cause distress to the Egyptians, and they succeeded.
It's also interesting how they are described as "signs" and "wonders." They were signs to the people, both Egyptian and Israelite, as they were the direct work of God for a specific purpose. We don't think about the wonders so much, though. That's not a term in our common vocabulary, probably because wonders as those don't occur normally. But they were some of the most amazing, large-scale supernatural events to occur in ancient times, so wonders is certainly correct.
It's also interesting that these acts are described as being performed "before our eyes." At this point, the original generation is dead, so any people who saw what happened had to have been young, not yet adults by our measure. Yet they still remember what was done for them, and the amazing feats that God performed to cause their freedom. Such memories live long and strong.