وَخُرُوجُ دُودَةٍ مِنْ جُرْحٍ وَأُذُنٍ وَأَنْفٍ، وَمَسُّ ذَكَرٍ، وَمَسُّ امْرَأَةٍ
3. A worm exits from a wound, ear or nose.
4. Touching one's penis/private part.
5. Touching a woman.
These do not invalidate Wudu by themselves in the Hanafi ruling stated here.