Something really weird happened at the beginning of clas on Fridays. It happened without warning or comment. What was it?? Here is what happened according to your descriptions.
Gender of person: Male (one said female)
Height: 5 ft 4 in. to 6 ft.
Weight: 120 to 185
Age: 18 to late 30's (or middle-aged)
Clothing:
Shirt: Red, blue, orange, black, gray, white, navy blue, pink/purple,
or yellow.
Headgear: Motorcycle helmet, blue, yellow and black or red color.
It had silver stripes or some white and black on it.
Pants: Black athletic pants, blue jeans, black windbreaker pants,
yellow pants, blue Adidas wind pants, blue pants, khaki pants, sweat pants,
baggy pants or black shorts.
Shoes: Sandals (only 1 report)
Other attire: Metal copper coil around right leg, cord around left knee,
wire around his leg, copper on his left leg, piece of metal wrapped around
his right leg, a bike lock around his leg or wires wrapped around his thigh
or leg
The person possibly was wearing yellow rubber gloves (3 reports).
This person either walked in or jumped up from behind the lecture table.
He was possibly carrying a black plastic bag, black messenger bag, bag
over his shoulders, purple Spandex bag, backpack which faced his stomach,
backpack in his hand, linen bag full of chains or other objects,
a large black sack over his shoulder on the right side, a sack around his
neck with something rattling inside, a bag of some type of metal things
or a blue backpack.
Actions:
Our visitor pounded/knocked on the lecture table at least once.
From the top of the lecture table he grabbed or stole an object resembling
a model of an atom, a cube of balls and sticks, "something,' "several items"
or atom model (only 5 reports).
The person was carrying things or keys that jingled in a bag, in his hand
or on his leg.
He hopped, jumped or skipped as he left the room.