WC breakfast can be fun. My DW and I stayed at WL in May and did the breakfast skillet (all you can eat). Our servers usually kept it full and we did not leave hungry.
As for antics -- a lot depends on your server. Some servers really get into the "spirit"; others are a little more low-key. They seem to take their signals from you. Here are some fun things to try:
1) Ask for ketchup -- even if you don't want it, ask for it anyway!
2) Ask for Pepsi -- again, even if you don't want a soft drink for breakfast, ask anyway!
3) Ask your server where you can buy GUM.
4) Ask your server for directions (or better yet, opinions) to/for Universal Studios.
You can have a lot of fun at WC. BTW, PS are highly recommended for meals there -- unless you like a LONG wait for seating.