that caused god to get uppity?
Edit: Summary of the Biblical narrative
The Worship of the Golden Calf by Filippino Lippi (1457–1504)
When Moses went up onto Mount Sinai to receive the Ten Commandments (Exodus 19:20), he left the Israelites for forty days and forty nights (Exodus 24:18). The Israelites feared that he would not return and asked Aaron to make gods for them (Exodus 32:1). The Bible does not note Aaron's opinion of this request, merely that he complied, and gathered up the Israelites' golden earrings. He melted them and constructed the golden calf. The Hebrew word calf can also mean circle. This might seem to indicate that they made a RA symbol rather than cast a calf, which would require a difficult manufacturing process with furnace, beeswax, clay, etc.
Aaron also built an altar before the calf / circle (RA), and the next day, the Israelites made offerings and celebrated.
The Lord told Moses that his people had corrupted themselves, and that he planned to eliminate them, but Moses argued and pleaded that they should be spared (Exodus 32:11); the Lord relented. Moses went down from the mountain, but upon seeing the calf, he too became angry. He threw down the tablets upon which God's law had been written, and broke them. Moses then burnt the golden calf in the fire, ground it to powder, scattered it on water, and forced the Israelites to drink it. He questioned Aaron about the event, who admitted to collecting the gold, throwing it into the fire, and out came a calf. Then Moses gathered the sons of Levi and set them to slaying a large number of adult males (3000). A plague then struck the Israelites. Nevertheless, the Lord stated that he would one day visit the Israelites' sin upon them. http://en.wikipedia.org/wiki/Golden_Calf